Science Explorer Interactive view Map
University · Sofia · Bulgaria

Sofia University "St. Kliment Ohridski"

In research, Sofia University "St. Kliment Ohridski" stands highest in Physical Sciences (#2,126 of 12,888 worldwide), Social Sciences (#2,036 of 10,521 worldwide) and Political Science and International Relations (#259 of 1,201 worldwide), 2022–2025. Relative to its size it is most specialised in Ecology, Evolution, Behavior and Systematics — Ecology, Evolution, Behavior and Systematics is 4.1× its share of world research.

uni-sofia.bgROR OpenAlex
World rank, 2022–2025
#2,714
of 28,054 · #2,022 all time
Rank in Bulgaria
#3
of 92
Research works
13k
▲ 51% vs 2013–17
Citations
144k
10.8 per fractional work
Top-10% rate
10.6%
record average 16.5%
Open access
38%
world 28%

What is Sofia University "St. Kliment Ohridski" known for in research?

The fields where it stands highest, 2022–2025, ranked among every institution above the floor in each field.

FieldWorld rankWhere that sitsTop-10% rateWorksAll time
Physical SciencesDomain #2,126 of 12,888 8.4%1,123 #1413
Social SciencesDomain #2,036 of 10,521 14.8%669 #2496
Political Science and International RelationsSubfield #259 of 1,201 26.2%71 #826
Social SciencesField #1,441 of 6,365 17.8%343 #1612
Health SciencesDomain #5,312 of 11,982 9.6%247 #7905
Computer ScienceField #2,110 of 4,667 10.8%209 #2082
MedicineField #5,158 of 10,443 9.7%189 #6786
Life SciencesDomain #4,206 of 7,800 10.0%303 #6416
Environmental ScienceField #2,154 of 3,551 8.5%170 #2705
Arts and HumanitiesField #1,250 of 1,998 13.6%120 #2056

Each strip is that field’s whole ranked pool, with the notch where Sofia University "St. Kliment Ohridski" 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 world mark, because the world rate differs by field (from about 6% to 21% in this record).

Which of those standings moved

The same fields on both windows: where it stood over the whole record, and where it stands in 2022–2025. The distance is the story, and it is the one thing the two rank columns above cannot show.

  1. Physical Sciences#1,413 #2,126
  2. Social Sciences#2,496 #2,036
  3. Political Science and International Relations#826 #259
  4. Social Sciences#1,612 #1,441
  5. Health Sciences#7,905 #5,312
  6. Computer Science#2,082 #2,110
  7. Medicine#6,786 #5,158
  8. Life Sciences#6,416 #4,206
  9. Environmental Science#2,705 #2,154
  10. Arts and Humanities#2,056 #1,250
all time2022–2025, better2022–2025, worse

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

What does Sofia University "St. Kliment Ohridski" specialise in?

Where its research is concentrated relative to its size: Ecology, Evolution, Behavior and Systematics takes 4.1× the share of its output that it takes of world research.

  1. Ecology, Evolution, Behavior and SystematicsSubfield · 44.9 works4.1×
← 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: 1.30× its world share, 144 worksAgricultural and Bio…Biochemistry, Genetics and Molecular Biology: 0.90× its world share, 112 worksBiochemistry, Geneti…Immunology and Microbiology: 0.80× its world share, 19 worksImmunology and Micro…Neuroscience: 0.50× its world share, 19 worksNeurosciencePharmacology, Toxicology and Pharmaceutics: 1.12× its world share, 9 worksPharmacology, Toxico…Chemical Engineering: 1.02× its world share, 8 worksChemical EngineeringChemistry: 2.23× its world share, 82 worksChemistryComputer Science: 1.15× its world share, 209 worksComputer ScienceEarth and Planetary Sciences: 2.65× its world share, 97 worksEarth and Planetary …Energy: 0.91× its world share, 20 worksEnergyEngineering: 0.54× its world share, 190 worksEngineeringEnvironmental Science: 1.46× its world share, 170 worksEnvironmental ScienceMaterials Science: 1.30× its world share, 106 worksMaterials ScienceMathematics: 3.15× its world share, 87 worksMathematicsPhysics and Astronomy: 2.95× its world share, 154 worksPhysics and AstronomyDentistry: 0.95× its world share, 11 worksDentistryHealth Professions: 0.60× its world share, 37 worksHealth ProfessionsMedicine: 0.42× its world share, 189 worksMedicineNursing: 0.80× its world share, 9 worksNursingVeterinary: 0.52× its world share, 2 worksVeterinaryArts and Humanities: 1.78× its world share, 120 worksArts and HumanitiesBusiness, Management and Accounting: 0.72× its world share, 54 worksBusiness, Management…Decision Sciences: 1.23× its world share, 28 worksDecision SciencesEconomics, Econometrics and Finance: 1.29× its world share, 65 worksEconomics, Econometr…Psychology: 0.83× its world share, 60 worksPsychologySocial Sciences: 1.16× its world share, 343 worksSocial Sciences1×world share
more than its size predictsabout as predictedless

Rings at 0.5×, 1× and 2×. Widest outward: Mathematics, 3.1×. Every wedge is a field page.

Who are the top researchers at Sofia University "St. Kliment Ohridski"?

Ranked on the composite score, A. Cabrera, V. N. Popov and Nikolay V. Vitanov lead among researchers whose main affiliation is Sofia University "St. Kliment Ohridski".

  1. 1 A. Cabrera Bulgaria · #32,002 worldwide 1.2k citations · 96 works
  2. 2 V. N. Popov Bulgaria · #34,989 worldwide 789 citations · 61 works
  3. 3 Nikolay V. Vitanov Bulgaria · #37,918 worldwide 651 citations · 81 works
  4. 4 L. Litov Bulgaria · #90,257 worldwide 3.6k citations · 433 works
  5. 5 Georgi N. Vayssilov Bulgaria · #112,625 worldwide 370 citations · 37 works
  6. 6 M. V. Abrashev Bulgaria · #146,725 worldwide 396 citations · 41 works
  7. 7 Peter A. Kralchevsky Bulgaria · #151,542 worldwide 408 citations · 48 works
  8. 8 Ivan B. Ivanov Bulgaria · #169,655 worldwide 266 citations · 24 works
  9. 9 Ivan P. Christov Bulgaria · #182,611 worldwide 171 citations · 42 works
  10. 10 Preslav Nakov Bulgaria · #189,887 worldwide 887 citations · 201 works
All ranked researchers at Sofia University "St. Kliment Ohridski"

Which keywords describe research at Sofia University "St. Kliment Ohridski"?

By fractional works in 2022–2025, weighted toward what it does more of than the world: Climate Change, Biogeography, Phylogeny, Taxonomy, Invasive Species, Machine Learning, Globalization and Self-Assembly.

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

Size is fractional works in 2022–2025 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. Climate Change97▲ 1.54×85 topics
  2. Machine Learning77◆ 1.01×69 topics
  3. Globalization61▲ 1.33×62 topics
  4. Deep Learning56▼ 0.69×61 topics
  5. Sustainability51◆ 0.89×54 topics
  6. Education45◆ 1.12×53 topics
  7. Social Media44▲ 1.31×22 topics
  8. Nanoparticles43▲ 1.45×34 topics
  9. Remote Sensing42▲ 1.47×32 topics
  10. Sustainable Development40◆ 1.08×50 topics
  11. Invasive Species38▲ 3.8×21 topics
  12. Identity38▲ 2.2×34 topics
  13. Biodiversity37▲ 2.1×25 topics
  14. Biogeography37▲ 6.0×19 topics
  15. Economic Growth36▲ 1.79×25 topics
  16. Self-Assembly31▲ 4.1×11 topics
  17. Phylogeny31▲ 8.7×16 topics
  18. Security29▲ 1.91×19 topics
  19. Taxonomy29▲ 9.6×13 topics
  20. Nationalism29▲ 2.6×20 topics
  21. Religion28▲ 2.5×20 topics
  22. Evolution27▲ 4.7×14 topics
  23. Toxicity24▲ 2.3×15 topics
  24. International Relations22▲ 3.9×16 topics
  25. Mediterranean22▲ 10.0×4 topics
  26. Holocene21▲ 7.8×3 topics
  27. Sea Level21▲ 9.1×2 topics
  28. Language20▲ 3.4×9 topics
  29. Morphology19▲ 4.8×10 topics
  30. Ecology19▲ 5.2×9 topics
  31. Black Sea18▲ 19×2 topics
  32. Surfactants18▲ 7.9×5 topics
  33. Sedimentation17▲ 13×2 topics
  34. Caspian Sea16▲ 24×1 topic
  35. paleoceanography16▲ 24×1 topic
  36. Religious Identity14▲ 9.8×4 topics
  37. Coleoptera13▲ 29×2 topics
  38. Speciation13▲ 14×3 topics
  39. Micelles13▲ 14×2 topics
  40. Viscoelasticity13▲ 8.5×3 topics

Which research topics does Sofia University "St. Kliment Ohridski" publish most on?

By volume in 2022–2025: Marine and environmental studies, Byzantine Studies and History, Linguistics, Language Diversity, and Identity and Geological and Geochemical Analysis.

Marine and environmental…16Marine and environmental studies: 16 fractional worksByzantine Studies and Hi…12Byzantine Studies and History: 12 fractional worksLinguistics, Language Diversity, and Identity: 11 fractional worksGeological and Geochemical Analysis: 11 fractional worksSurfactants and Colloidal Systems: 11 fractional worksRadiation Detection and Scintillator Technologies: 10 fractional worksColeoptera Taxonomy and Distribution: 10 fractional worksDiscourse Analysis and C…9Discourse Analysis and Cultural Communication: 9 fractional worksBlockchain Technology Applications and Security: 9 fractional worksEducational Games and Gamification: 8 fractional works
OceanographyClassicsLanguage and LinguisticsGeophysics6 others

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

  1. 1 Marine and environmental studies Oceanography 16 works
  2. 2 Byzantine Studies and History Classics 12 works
  3. 3 Linguistics, Language Diversity, and Identity Language and Linguistics 11 works
  4. 4 Geological and Geochemical Analysis Geophysics 11 works
  5. 5 Surfactants and Colloidal Systems Organic Chemistry 11 works
  6. 6 Radiation Detection and Scintillator Technologies Radiation 10 works
  7. 7 Coleoptera Taxonomy and Distribution Ecology, Evolution, Behavior and Systematics 10 works
  8. 8 Discourse Analysis and Cultural Communication Cultural Studies 9 works
  9. 9 Blockchain Technology Applications and Security Information Systems 9 works
  10. 10 Educational Games and Gamification Developmental and Educational Psychology 8 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 available38.5%not open61.5%

World: 28% of research is openly available.

with international co-authors21.5%domestic only78.5%

World: 19% is written across borders.

How has Sofia University "St. Kliment Ohridski"'s research output changed?

Output in 2018–2022 was 51% higher than in 2013–2017.

1990200020102020
grewheldshrank

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

Other research institutions in Sofia

All research institutions in Sofia

Research measures only: rankings here say nothing about teaching, admissions or student experience. Comparable institutions and collaboration partners are in the interactive view on the map.