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University · Sofia · Bulgaria

Technical University of Sofia

In research, Technical University of Sofia stands highest in Engineering (#3,648 of 5,901 worldwide), Materials Science (#1,546 of 2,276 worldwide) and Mechanical Engineering (#1,061 of 1,319 worldwide), 2022-now. Relative to its size it is most specialised in Industrial and Manufacturing Engineering, Automotive Engineering and Control and Systems Engineering (Industrial and Manufacturing Engineering is 9.2× its share of world research).

tu-sofia.bgROR OpenAlex
World rank, 2022-now
#11,457
of 22,385 · #20,961 all time
Rank in Bulgaria
#27
of 64
Research works
8.4k
▲ 18% vs 2018-21
Citations
34k
4.0 per fractional work
Top-10% rate
3.7%
all institutions 10.0%
vs its own fields
0.40×
1.00× is exactly expected
Open access
29%
world 40%
International
14%
world 18%
Technical University of Sofia

What is Technical University of Sofia known for in research?

The fields where it stands highest, 2022-now, ranked among every institution above the floor in each field.

FieldWorld rankWhere that sitsTop-10% rateWorksAll time
EngineeringField #3,648 of 5,901 3.1%1,477 #4849
Materials ScienceField #1,546 of 2,276 0.9%97 #2463
Mechanical EngineeringSubfield #1,061 of 1,319 2.7%197 #2195
Physical SciencesDomain #9,031 of 10,670 2.9%2,447 #15283
Electrical and Electronic EngineeringSubfield #1,861 of 2,176 3.4%428 #3170
Computer Networks and CommunicationsSubfield #648 of 728 5.0%116 #1663
Computer ScienceField #3,952 of 4,417 2.8%529 #4856
Control and Systems EngineeringSubfield #723 of 804 2.9%192 #1432
Industrial and Manufacturing EngineeringSubfield #287 of 316 4.9%141 #741
Aerospace EngineeringSubfield #724 of 785 1.3%90 #1457

Each strip is that field's whole ranked pool, with the notch where Technical University of Sofia sits in it, in the colour of the band that rank falls in. The track under the rate is the rate itself: it carries no average mark, because the average differs by field (from about 6% in Dentistry to 21% in Economics).

Which of those standings moved

The same fields on both windows: where it stood over the whole record, and where it stands in 2022-now. The distance is the story, and it is the one thing the two rank columns above cannot show.

  1. Engineering#4,849 #3,648
  2. Materials Science#2,463 #1,546
  3. Mechanical Engineering#2,195 #1,061
  4. Physical Sciences#15,283 #9,031
  5. Electrical and Electronic Engineering#3,170 #1,861
  6. Computer Networks and Communications#1,663 #648
  7. Computer Science#4,856 #3,952
  8. Control and Systems Engineering#1,432 #723
  9. Industrial and Manufacturing Engineering#741 #287
  10. Aerospace Engineering#1,457 #724
all time2022-now, better2022-now, worse

A dot further right is a better standing. Fields it was not ranked in over the whole record are left out.

Which fields of science does Technical University of Sofia work in?

In 2022-now, 86% of research at Technical University of Sofia is in Physical Sciences, 8% in Social Sciences. Its largest fields are Engineering (51%), Computer Science (18%), Environmental Science (4%). It does 2.2× the world's share of Physical Sciences.

Physical Sciences: 2,608 fractional works · 85.6% of its workEngineering: 1,564 fractional works · 51.3% of its workElectrical and Electronic Engineering: 455 fractional works · 14.9% of its workMechanical Engineering: 207 fractional works · 6.8% of its workControl and Systems Engineering: 204 fractional works · 6.7% of its workIndustrial and Manufacturing Engineering: 144 fractional works · 4.7% of its workAutomotive Engineering: 104 fractional works · 3.4% of its workBiomedical Engineering: 99 fractional works · 3.2% of its workAerospace Engineering: 98 fractional works · 3.2% of its workMechanics of Materials: 55 fractional works · 1.8% of its workBuilding and Construction: 44 fractional works · 1.4% of its workCivil and Structural Engineering: 37 fractional works · 1.2% of its workMedia Technology: 32 fractional works · 1.0% of its workComputational Mechanics: 32 fractional works · 1.0% of its workOcean Engineering: 24 fractional works · 0.8% of its workSafety, Risk, Reliability and Quality: 24 fractional works · 0.8% of its workComputer Science: 561 fractional works · 18.4% of its workArtificial Intelligence: 147 fractional works · 4.8% of its workComputer Networks and Communications: 122 fractional works · 4.0% of its workComputer Vision and Pattern Recognition: 96 fractional works · 3.1% of its workInformation Systems: 85 fractional works · 2.8% of its workSignal Processing: 28 fractional works · 0.9% of its workComputer Science Applications: 23 fractional works · 0.8% of its workHardware and Architecture: 18 fractional works · 0.6% of its workComputational Theory and Mathematics: 17 fractional works · 0.5% of its workComputer Graphics and Computer-Aided Design: 12 fractional works · 0.4% of its workHuman-Computer Interaction: 11 fractional works · 0.3% of its workSmaller subfields together: 5 fractional works · 0.2% of its workEnvironmental Science: 120 fractional works · 3.9% of its workGlobal and Planetary Change: 39 fractional works · 1.3% of its workEnvironmental Engineering: 37 fractional works · 1.2% of its workWater Science and Technology: 8 fractional works · 0.2% of its workManagement, Monitoring, Policy and Law: 7 fractional works · 0.2% of its workPollution: 7 fractional works · 0.2% of its workHealth, Toxicology and Mutagenesis: 6 fractional works · 0.2% of its workEcology: 6 fractional works · 0.2% of its workSmaller subfields together: 10 fractional works · 0.3% of its workMaterials Science: 106 fractional works · 3.5% of its workMaterials Chemistry: 51 fractional works · 1.7% of its workPolymers and Plastics: 19 fractional works · 0.6% of its workElectronic, Optical and Magnetic Materials: 16 fractional works · 0.5% of its workBiomaterials: 9 fractional works · 0.3% of its workGeneral Materials Science: 8 fractional works · 0.3% of its workSmaller subfields together: 4 fractional works · 0.1% of its workEnergy: 93 fractional works · 3.0% of its workRenewable Energy, Sustainability and the Environment: 61 fractional works · 2.0% of its workEnergy Engineering and Power Technology: 19 fractional works · 0.6% of its workGeneral Energy: 10 fractional works · 0.3% of its workSmaller subfields together: 2 fractional works · 0.1% of its workPhysics and Astronomy: 71 fractional works · 2.3% of its workAtomic and Molecular Physics, and Optics: 30 fractional works · 1.0% of its workStatistical and Nonlinear Physics: 17 fractional works · 0.5% of its workAstronomy and Astrophysics: 15 fractional works · 0.5% of its workSmaller subfields together: 11 fractional works · 0.3% of its workMathematics: 52 fractional works · 1.7% of its workAlgebra and Number Theory: 12 fractional works · 0.4% of its workApplied Mathematics: 9 fractional works · 0.3% of its workMathematical Physics: 7 fractional works · 0.2% of its workNumerical Analysis: 7 fractional works · 0.2% of its workSmaller subfields together: 17 fractional works · 0.6% of its workEarth and Planetary Sciences: 17 fractional works · 0.6% of its workChemical Engineering: 13 fractional works · 0.4% of its workFluid Flow and Transfer Processes: 7 fractional works · 0.2% of its workSmaller subfields together: 6 fractional works · 0.2% of its workChemistry: 10 fractional works · 0.3% of its workSocial Sciences: 231 fractional works · 7.6% of its workBusiness, Management and Accounting: 80 fractional works · 2.6% of its workManagement Information Systems: 26 fractional works · 0.8% of its workManagement of Technology and Innovation: 24 fractional works · 0.8% of its workStrategy and Management: 15 fractional works · 0.5% of its workAccounting: 6 fractional works · 0.2% of its workSmaller subfields together: 8 fractional works · 0.3% of its workSocial Sciences: 59 fractional works · 1.9% of its workEducation: 16 fractional works · 0.5% of its workSociology and Political Science: 9 fractional works · 0.3% of its workTransportation: 8 fractional works · 0.3% of its workPolitical Science and International Relations: 8 fractional works · 0.3% of its workSmaller subfields together: 18 fractional works · 0.6% of its workDecision Sciences: 39 fractional works · 1.3% of its workManagement Science and Operations Research: 21 fractional works · 0.7% of its workStatistics, Probability and Uncertainty: 9 fractional works · 0.3% of its workInformation Systems and Management: 8 fractional works · 0.3% of its workEconomics, Econometrics and Finance: 26 fractional works · 0.8% of its workEconomics and Econometrics: 15 fractional works · 0.5% of its workGeneral Economics, Econometrics and Finance: 6 fractional works · 0.2% of its workSmaller subfields together: 4 fractional works · 0.1% of its workPsychology: 19 fractional works · 0.6% of its workSocial Psychology: 10 fractional works · 0.3% of its workSmaller subfields together: 9 fractional works · 0.3% of its workArts and Humanities: 8 fractional works · 0.3% of its workHealth Sciences: 109 fractional works · 3.6% of its workMedicine: 85 fractional works · 2.8% of its workRadiology, Nuclear Medicine and Imaging: 15 fractional works · 0.5% of its workPulmonary and Respiratory Medicine: 15 fractional works · 0.5% of its workCardiology and Cardiovascular Medicine: 8 fractional works · 0.3% of its workSurgery: 7 fractional works · 0.2% of its workSmaller subfields together: 41 fractional works · 1.3% of its workHealth Professions: 13 fractional works · 0.4% of its workHealth Information Management: 8 fractional works · 0.2% of its workSmaller subfields together: 5 fractional works · 0.2% of its workDentistry: 6 fractional works · 0.2% of its workNursing: 3 fractional works · 0.1% of its workVeterinary: 2 fractional works · 0.1% of its workLife Sciences: 99 fractional works · 3.3% of its workAgricultural and Biological Sciences: 54 fractional works · 1.8% of its workPlant Science: 23 fractional works · 0.8% of its workFood Science: 16 fractional works · 0.5% of its workAnimal Science and Zoology: 7 fractional works · 0.2% of its workSmaller subfields together: 8 fractional works · 0.3% of its workBiochemistry, Genetics and Molecular Biology: 26 fractional works · 0.9% of its workMolecular Biology: 17 fractional works · 0.6% of its workSmaller subfields together: 10 fractional works · 0.3% of its workNeuroscience: 19 fractional works · 0.6% of its workCognitive Neuroscience: 11 fractional works · 0.4% of its workCellular and Molecular Neuroscience: 7 fractional works · 0.2% of its workSmaller subfields together: 1 fractional works · 0.0% of its workALL ITS WORKTechnicalUniversity of…3,047fractional works, 2022-now
Life Sciences3%Physical Sciences86%Health Sciences4%Social Sciences8%

Each ring splits the one inside it: the four domains of science, their fields, their subfields. Size is fractional works in 2022-now. Every slice is a page; the interactive view zooms down to single topics and colours each by how much more of it this institution does than the world.

Its 4 domains and 26 fields, with their numbers
    1. Engineering1,56451.3%
    2. Computer Science56118.4%
    3. Environmental Science1203.9%
    4. Materials Science1063.5%
    5. Energy933.0%
    6. Physics and Astronomy712.3%
    7. Mathematics521.7%
    8. Earth and Planetary Sciences170.6%
    9. Chemical Engineering130.4%
    10. Chemistry100.3%
    1. Business, Management and Accounting802.6%
    2. Social Sciences591.9%
    3. Decision Sciences391.3%
    4. Economics, Econometrics and Finance260.8%
    5. Psychology190.6%
    6. Arts and Humanities80.3%
    1. Medicine852.8%
    2. Health Professions130.4%
    3. Dentistry60.2%
    4. Nursing30.1%
    5. Veterinary20.1%
    1. Agricultural and Biological Sciences541.8%
    2. Biochemistry, Genetics and Molecular Biology260.9%
    3. Neuroscience190.6%
    4. Immunology and Microbiology00.0%
    5. Pharmacology, Toxicology and Pharmaceutics00.0%
All of science, and how each field's share has moved since 1950: the Science domain explorer

What does Technical University of Sofia specialise in?

Where its research is concentrated relative to its size: Industrial and Manufacturing Engineering takes 9.2× the share of its output that it takes of world research.

  1. Industrial and Manufacturing EngineeringSubfield · 144.4 works9.2×
  2. Automotive EngineeringSubfield · 103.8 works6.4×
  3. Control and Systems EngineeringSubfield · 204.3 works6.2×
← less than its size predicts1×more →

Location quotient, a volume reading rather than an impact one. It surfaces small, lopsided specialities.

Field profile

Location quotient across every field it publishes in: outside the ring is more than an institution of this size would be expected to publish, inside it is less.

Agricultural and Biological Sciences: 0.37× its world share, 54 worksAgricultural and Bio…Biochemistry, Genetics and Molecular Biology: 0.16× its world share, 26 worksBiochemistry, Geneti…Immunology and Microbiology: 0.02× its world share, 0 worksImmunology and Micro…Neuroscience: 0.38× its world share, 19 worksNeurosciencePharmacology, Toxicology and Pharmaceutics: 0.03× its world share, 0 worksPharmacology, Toxico…Chemical Engineering: 1.25× its world share, 13 worksChemical EngineeringChemistry: 0.21× its world share, 10 worksChemistryComputer Science: 2.37× its world share, 561 worksComputer ScienceEarth and Planetary Sciences: 0.36× its world share, 17 worksEarth and Planetary …Energy: 3.31× its world share, 93 worksEnergyEngineering: 3.42× its world share, 1,564 worksEngineeringEnvironmental Science: 0.79× its world share, 120 worksEnvironmental ScienceMaterials Science: 1.00× its world share, 106 worksMaterials ScienceMathematics: 1.44× its world share, 52 worksMathematicsPhysics and Astronomy: 1.05× its world share, 72 worksPhysics and AstronomyDentistry: 0.40× its world share, 6 worksDentistryHealth Professions: 0.16× its world share, 13 worksHealth ProfessionsMedicine: 0.15× its world share, 85 worksMedicineNursing: 0.23× its world share, 3 worksNursingVeterinary: 0.46× its world share, 2 worksVeterinaryArts and Humanities: 0.09× its world share, 8 worksArts and HumanitiesBusiness, Management and Accounting: 0.82× its world share, 80 worksBusiness, Management…Decision Sciences: 1.32× its world share, 39 worksDecision SciencesEconomics, Econometrics and Finance: 0.39× its world share, 26 worksEconomics, Econometr…Psychology: 0.21× its world share, 19 worksPsychologySocial Sciences: 0.15× its world share, 59 worksSocial Sciences1×world share
more than its size predictsabout as predictedless

Rings at 0.5×, 1× and 2×. Widest outward: Engineering, 3.4×. Every wedge is a field page.

All 26 fields, with their numbers
  1. Engineering3.42×1,564 works
  2. Energy3.31×93 works
  3. Computer Science2.37×561 works
  4. Mathematics1.44×52 works
  5. Decision Sciences1.32×39 works
  6. Chemical Engineering1.25×13 works
  7. Physics and Astronomy1.05×72 works
  8. Materials Science1.00×106 works
  9. Business, Management and Accounting0.82×80 works
  10. Environmental Science0.79×120 works
  11. Veterinary0.46×2 works
  12. Dentistry0.40×6 works
  13. Economics, Econometrics and Finance0.39×26 works
  14. Neuroscience0.38×19 works
  15. Agricultural and Biological Sciences0.37×54 works
  16. Earth and Planetary Sciences0.36×17 works
  17. Nursing0.23×3 works
  18. Chemistry0.21×10 works
  19. Psychology0.21×19 works
  20. Biochemistry, Genetics and Molecular Biology0.16×26 works
  21. Health Professions0.16×13 works
  22. Medicine0.15×85 works
  23. Social Sciences0.15×59 works
  24. Arts and Humanities0.09×8 works
  25. Pharmacology, Toxicology and Pharmaceutics0.03×0 works
  26. Immunology and Microbiology0.02×0 works

Who are the top researchers at Technical University of Sofia?

Ranked on the quality score, Zahari Zarkov, Aleksandar Georgiev and George Pitchurov lead among researchers whose main affiliation is Technical University of Sofia.

  1. 1 Zahari Zarkov Bulgaria · #1,250,598 worldwide 11k citations · 93 works
  2. 2 Aleksandar Georgiev Bulgaria · #1,646,412 worldwide 1.1k citations · 60 works
  3. 3 George Pitchurov Bulgaria · #2,195,683 worldwide 270 citations · 17 works
  4. 4 Dimityr Popov Bulgaria · #3,797,004 worldwide 425 citations · 18 works
  5. 5 M.H. Azadmanesh Bulgaria · #4,286,739 worldwide 415 citations · 26 works
  6. 6 Kostadin A. Fikiin Bulgaria · #4,768,764 worldwide 900 citations · 63 works
  7. 7 Nikolay Yordanov Bulgaria · #4,854,933 worldwide 83 citations · 20 works
  8. 8 Nikola Georgiev #5,087,382 worldwide 92 citations · 27 works
  9. 9 Krasimira Ivanova Bulgaria · #5,182,694 worldwide 166 citations · 70 works
  10. 10 Trayan Ganev Stamov Bulgaria · #5,195,885 worldwide 499 citations · 30 works
All ranked researchers at Technical University of Sofia

What are the most cited papers from Technical University of Sofia?

The most cited paper from Technical University of Sofia is "Energy Management and Operational Planning of a Microgrid With a PV-Based Active Generator for Smart Grid Applications" (Hristiyan Chavdarov Kanchev, Di Lu, Frédéric Colas et al., 2011), with 988 citations. Next come "Multilayer perceptron and neural networks" (599) and "A MHz-repetition-rate hard X-ray free-electron laser driven by a superconducting linear accelerator" (548).

Most cited papers
#PaperReleasedCitations
1 Energy Management and Operational Planning of a Microgrid With a PV-Based Active Generator for Smart Grid Applications Hristiyan Chavdarov Kanchev, Di Lu, Frédéric Colas et al. · IEEE Transactions on Industrial Electronics Open access 2 Mar 2011 988
2 Multilayer perceptron and neural networks Marius-Constantin Popescu, Valentina Emilia Bălaş, Liliana Perescu-Popescu et al. Jul 2009 599
3 A MHz-repetition-rate hard X-ray free-electron laser driven by a superconducting linear accelerator Winfried Decking et al. · Nature Photonics Open access483 authors 18 May 2020 548
4 Optimal sizing of a grid-connected PV system for various PV module technologies and inclinations, inverter efficiency characteristics and locations Gilles Notton, Vladimir Lazarov, Ludmil Stoyanov · Renewable Energy 13 Aug 2009 305
5 Risk identification – basic stage in risk management Lubka Tchankova · Environmental Management and Health Aug 2002 273
All 61 most cited papers, with filters and sorting

Which keywords describe research at Technical University of Sofia?

By fractional works in 2022-now, weighted toward what it does more of than the world: Renewable Energy, Energy Efficiency, Deep Learning, Power Electronics, Machine Learning, Neural Networks, Renewable Energy Integration and Control Systems.

▲ more of its work than of the world's◆ about the world's share▼ less than the world's

Size is fractional works in 2022-now in the topics tagged with each word; colour is the word's share of this institution's work against its share of the world's. The 40 words are chosen for being large and distinctive. Each links to the topic it comes from most.

All 40 words, with their numbers
  1. Deep Learning243▲ 2.3×75 topics
  2. Machine Learning227▲ 2.2×82 topics
  3. Renewable Energy216▲ 4.9×40 topics
  4. Energy Efficiency178▲ 6.3×40 topics
  5. Neural Networks167▲ 3.5×37 topics
  6. Sustainability149▲ 2.0×47 topics
  7. Power Electronics128▲ 13×8 topics
  8. Internet of Things96▲ 3.7×22 topics
  9. Optimization93▲ 6.8×24 topics
  10. Renewable Energy Integration89▲ 8.9×6 topics
  11. Control Systems89▲ 16×12 topics
  12. Artificial Intelligence84▲ 1.95×41 topics
  13. Big Data84▲ 2.9×24 topics
  14. Artificial Neural Networks76▲ 5.4×9 topics
  15. Smart Grid76▲ 6.9×9 topics
  16. Model Predictive Control75▲ 9.6×6 topics
  17. Cyber-Physical Systems71▲ 8.8×9 topics
  18. Security68▲ 3.3×21 topics
  19. Thermal Analysis64▲ 17×9 topics
  20. Electric Vehicles61▲ 7.0×4 topics
  21. IoT54▲ 4.7×16 topics
  22. Thermal Management46▲ 4.6×8 topics
  23. Tool Wear44▲ 11×3 topics
  24. Machine Tools44▲ 22×3 topics
  25. Fault Tolerance43▲ 9.2×7 topics
  26. IoT Security43▲ 4.6×3 topics
  27. Simulation42▲ 5.4×15 topics
  28. Smart Home42▲ 8.4×4 topics
  29. Reliability41▲ 18×3 topics
  30. Electric Drives40▲ 34×2 topics
  31. Electric Vehicle Charging39▲ 16×2 topics
  32. Parameter Estimation39▲ 10×6 topics
  33. Photovoltaic Systems38▲ 15×3 topics
  34. Industry 4.035▲ 22×3 topics
  35. Efficiency Optimization34▲ 24×2 topics
  36. DC-DC Converters33▲ 20×1 topic
  37. High-Frequency Power Conversion33▲ 20×1 topic
  38. Mathematical Modeling33▲ 12×4 topics
  39. Energy Storage Systems32▲ 7.6×2 topics
  40. Virtual Prototyping32▲ 12×2 topics

Which research topics does Technical University of Sofia publish most on?

By volume in 2022-now: Advanced DC-DC Converters, Manufacturing Process and Optimization, Engineering Technology and Methodologies and Electric Power Systems and Control.

Advanced DC-DC Converters33Advanced DC-DC Converters: 33 fractional worksManufacturing Process an…30Manufacturing Process and Optimization: 30 fractional worksEngineering Technology and Methodologies: 30 fractional worksElectric Power Systems a…28Electric Power Systems and Control: 28 fractional worksAdvanced Battery Technol…28Advanced Battery Technologies Research: 28 fractional worksInduction Heating and Inverter Technology: 27 fractional worksImpact of Light on Environment and Health: 27 fractional worksMultilevel Inverters and…22Multilevel Inverters and Converters: 22 fractional worksDigital Transformation in Industry: 21 fractional worksAdditive Manufacturing and 3D Printing Technologies: 21 fractional works
Electrical and Electronic EngineeringIndustrial and Manufacturing EngineeringAutomotive EngineeringMechanical Engineering1 others

Area is fractional works; colour is the subfield each topic belongs to.

  1. 1 Advanced DC-DC Converters Electrical and Electronic Engineering 33 works
  2. 2 Manufacturing Process and Optimization Industrial and Manufacturing Engineering 30 works
  3. 3 Engineering Technology and Methodologies Industrial and Manufacturing Engineering 30 works
  4. 4 Electric Power Systems and Control Electrical and Electronic Engineering 28 works
  5. 5 Advanced Battery Technologies Research Automotive Engineering 28 works
  6. 6 Induction Heating and Inverter Technology Mechanical Engineering 27 works
  7. 7 Impact of Light on Environment and Health Global and Planetary Change 27 works
  8. 8 Multilevel Inverters and Converters Electrical and Electronic Engineering 22 works
  9. 9 Digital Transformation in Industry Industrial and Manufacturing Engineering 21 works
  10. 10 Additive Manufacturing and 3D Printing Technologies Automotive Engineering 21 works

How open and international is its research?

Against the world's own shares: the tick on each track. Both are shares of its output, so they sit on one scale and can be read against each other as well as against the world.

openly available28.7%not open71.3%

World: 40% of research is openly available.

with international co-authors13.9%domestic only86.1%

World: 18% is written across borders.

How has Technical University of Sofia's research output changed?

Output in 2022-2025 was 18% higher than in 2018-2021.

still counting1990200020102020
grewheldshrank

The same series as a ribbon: one cell per year, darker for more. The line above answers how much; this answers when.

Its share of all research

Growing output can still be a shrinking share: all of science grows. This is Technical University of Sofia as a percentage of every work published that year, 0.013% in 2024.

still counting0.010%0.020%Technical University of Sofia0.014% in 202519801990200020102020

Fractional works of Technical University of Sofia over all fractional works that year. How the balance of science has shifted.

How much of it reaches the world top 10%

Year by year, against all institutions in the same year.

still counting5%10%15%all institutions10.0% in 2025Technical University of Sofia3.5% in 2025200020102020

Of each year's output, the share that reached the world's 10% most cited for its field and year. Peak 5.2% in 1998.

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Technical University of Sofia on Science Explorer

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