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Company · Mexico City · Mexico

Pemex (Mexico)

In research, Pemex (Mexico) stands highest in Health Sciences (#7,214 of 9,902 worldwide), Medicine (#6,299 of 8,541 worldwide) and Physical Sciences (#9,368 of 10,670 worldwide), 2022-now. Relative to its size it is most specialised in Surgery (Surgery is 6.6× its share of world research).

pemex.com/Paginas/default.aspxROR OpenAlex
World rank, 2022-now
#9,998
of 22,385 · #12,740 all time
Rank in Mexico
#105
of 232
Research works
1.9k
▲ 14% vs 2018-21
Citations
9.1k
4.8 per fractional work
Top-10% rate
3.1%
all institutions 10.0%
vs its own fields
0.79×
1.00× is exactly expected
Open access
28%
world 40%
International
29%
world 18%
Pemex (Mexico)

What is Pemex (Mexico) 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
Health SciencesDomain #7,214 of 9,902 1.7%143 #11531
MedicineField #6,299 of 8,541 1.3%133 #10168
Physical SciencesDomain #9,368 of 10,670 2.1%65 #10234

Each strip is that field's whole ranked pool, with the notch where Pemex (Mexico) 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. Health Sciences#11,531 #7,214
  2. Medicine#10,168 #6,299
  3. Physical Sciences#10,234 #9,368
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 Pemex (Mexico) work in?

In 2022-now, 54% of research at Pemex (Mexico) is in Health Sciences, 24% in Physical Sciences. Its largest fields are Medicine (50%), Engineering (12%), Social Sciences (8%). It does 2.3× the world's share of Health Sciences.

Health Sciences: 159 fractional works · 53.5% of its workMedicine: 149 fractional works · 50.0% of its workSurgery: 46 fractional works · 15.4% of its workPulmonary and Respiratory Medicine: 14 fractional works · 4.6% of its workCardiology and Cardiovascular Medicine: 10 fractional works · 3.5% of its workEpidemiology: 8 fractional works · 2.6% of its workOncology: 7 fractional works · 2.4% of its workNeurology: 5 fractional works · 1.6% of its workPathology and Forensic Medicine: 5 fractional works · 1.6% of its workInfectious Diseases: 5 fractional works · 1.6% of its workDermatology: 4 fractional works · 1.4% of its workPublic Health, Environmental and Occupational Health: 4 fractional works · 1.4% of its workRadiology, Nuclear Medicine and Imaging: 4 fractional works · 1.3% of its workNephrology: 4 fractional works · 1.3% of its workRheumatology: 3 fractional works · 1.1% of its workGenetics: 3 fractional works · 1.0% of its workPhysiology: 3 fractional works · 1.0% of its workEndocrinology, Diabetes and Metabolism: 2 fractional works · 0.8% of its workPediatrics, Perinatology and Child Health: 2 fractional works · 0.8% of its workEmergency Medicine: 2 fractional works · 0.8% of its workRehabilitation: 2 fractional works · 0.7% of its workHematology: 2 fractional works · 0.7% of its workOphthalmology: 2 fractional works · 0.6% of its workPsychiatry and Mental health: 2 fractional works · 0.6% of its workOtorhinolaryngology: 1 fractional works · 0.5% of its workHepatology: 1 fractional works · 0.5% of its workAnesthesiology and Pain Medicine: 1 fractional works · 0.4% of its workObstetrics and Gynecology: 1 fractional works · 0.3% of its workReproductive Medicine: 1 fractional works · 0.3% of its workTransplantation: 1 fractional works · 0.3% of its workGastroenterology: 1 fractional works · 0.2% of its workCritical Care and Intensive Care Medicine: 1 fractional works · 0.2% of its workSmaller subfields together: 2 fractional works · 0.6% of its workHealth Professions: 8 fractional works · 2.7% of its workGeneral Health Professions: 3 fractional works · 1.0% of its workPharmacy: 1 fractional works · 0.5% of its workEmergency Medical Services: 1 fractional works · 0.4% of its workOccupational Therapy: 1 fractional works · 0.3% of its workSpeech and Hearing: 1 fractional works · 0.3% of its workHealth Information Management: 1 fractional works · 0.2% of its workSmaller subfields together: 0 fractional works · 0.1% of its workDentistry: 2 fractional works · 0.6% of its workOral Surgery: 1 fractional works · 0.5% of its workSmaller subfields together: 0 fractional works · 0.1% of its workVeterinary: 1 fractional works · 0.2% of its workNursing: 0 fractional works · 0.0% of its workPhysical Sciences: 72 fractional works · 24.3% of its workEngineering: 36 fractional works · 12.1% of its workOcean Engineering: 19 fractional works · 6.3% of its workMechanical Engineering: 7 fractional works · 2.3% of its workMechanics of Materials: 4 fractional works · 1.2% of its workBiomedical Engineering: 2 fractional works · 0.7% of its workElectrical and Electronic Engineering: 1 fractional works · 0.4% of its workComputational Mechanics: 1 fractional works · 0.3% of its workBuilding and Construction: 1 fractional works · 0.3% of its workAerospace Engineering: 1 fractional works · 0.2% of its workSmaller subfields together: 1 fractional works · 0.4% of its workEarth and Planetary Sciences: 16 fractional works · 5.3% of its workGeophysics: 12 fractional works · 4.2% of its workOceanography: 1 fractional works · 0.3% of its workPaleontology: 1 fractional works · 0.3% of its workSmaller subfields together: 1 fractional works · 0.5% of its workEnvironmental Science: 9 fractional works · 3.1% of its workWater Science and Technology: 2 fractional works · 0.7% of its workEcology: 2 fractional works · 0.7% of its workManagement, Monitoring, Policy and Law: 1 fractional works · 0.4% of its workEnvironmental Engineering: 1 fractional works · 0.3% of its workGlobal and Planetary Change: 1 fractional works · 0.3% of its workNature and Landscape Conservation: 1 fractional works · 0.2% of its workSmaller subfields together: 1 fractional works · 0.4% of its workComputer Science: 5 fractional works · 1.8% of its workArtificial Intelligence: 2 fractional works · 0.6% of its workInformation Systems: 1 fractional works · 0.5% of its workHuman-Computer Interaction: 1 fractional works · 0.3% of its workSmaller subfields together: 1 fractional works · 0.3% of its workPhysics and Astronomy: 2 fractional works · 0.6% of its workAstronomy and Astrophysics: 1 fractional works · 0.4% of its workSmaller subfields together: 1 fractional works · 0.3% of its workMaterials Science: 2 fractional works · 0.5% of its workBiomaterials: 1 fractional works · 0.2% of its workMaterials Chemistry: 1 fractional works · 0.2% of its workSmaller subfields together: 0 fractional works · 0.1% of its workChemistry: 1 fractional works · 0.4% of its workAnalytical Chemistry: 1 fractional works · 0.3% of its workSmaller subfields together: 0 fractional works · 0.1% of its workMathematics: 1 fractional works · 0.3% of its workEnergy: 1 fractional works · 0.2% of its workChemical Engineering: 0 fractional works · 0.1% of its workSocial Sciences: 41 fractional works · 13.7% of its workSocial Sciences: 24 fractional works · 7.9% of its workSociology and Political Science: 7 fractional works · 2.4% of its workEducation: 4 fractional works · 1.3% of its workLaw: 3 fractional works · 0.8% of its workSafety Research: 2 fractional works · 0.6% of its workDemography: 2 fractional works · 0.6% of its workPolitical Science and International Relations: 1 fractional works · 0.5% of its workCultural Studies: 1 fractional works · 0.4% of its workUrban Studies: 1 fractional works · 0.3% of its workGender Studies: 1 fractional works · 0.2% of its workSmaller subfields together: 2 fractional works · 0.7% of its workEconomics, Econometrics and Finance: 5 fractional works · 1.8% of its workEconomics and Econometrics: 5 fractional works · 1.8% of its workSmaller subfields together: 0 fractional works · 0.0% of its workArts and Humanities: 5 fractional works · 1.6% of its workLiterature and Literary Theory: 2 fractional works · 0.8% of its workArcheology: 1 fractional works · 0.2% of its workLanguage and Linguistics: 1 fractional works · 0.2% of its workSmaller subfields together: 1 fractional works · 0.3% of its workPsychology: 4 fractional works · 1.4% of its workClinical Psychology: 2 fractional works · 0.7% of its workDevelopmental and Educational Psychology: 1 fractional works · 0.4% of its workSmaller subfields together: 1 fractional works · 0.3% of its workBusiness, Management and Accounting: 3 fractional works · 1.0% of its workOrganizational Behavior and Human Resource Management: 1 fractional works · 0.4% of its workAccounting: 1 fractional works · 0.3% of its workSmaller subfields together: 1 fractional works · 0.4% of its workDecision Sciences: 0 fractional works · 0.0% of its workLife Sciences: 25 fractional works · 8.5% of its workBiochemistry, Genetics and Molecular Biology: 13 fractional works · 4.3% of its workGenetics: 6 fractional works · 2.1% of its workMolecular Biology: 3 fractional works · 1.0% of its workCell Biology: 1 fractional works · 0.4% of its workCancer Research: 1 fractional works · 0.3% of its workDevelopmental Biology: 1 fractional works · 0.2% of its workSmaller subfields together: 1 fractional works · 0.3% of its workAgricultural and Biological Sciences: 6 fractional works · 2.1% of its workForestry: 1 fractional works · 0.5% of its workPlant Science: 1 fractional works · 0.4% of its workEcology, Evolution, Behavior and Systematics: 1 fractional works · 0.4% of its workInsect Science: 1 fractional works · 0.2% of its workFood Science: 1 fractional works · 0.2% of its workSmaller subfields together: 1 fractional works · 0.4% of its workNeuroscience: 4 fractional works · 1.3% of its workCellular and Molecular Neuroscience: 1 fractional works · 0.4% of its workSensory Systems: 1 fractional works · 0.2% of its workEndocrine and Autonomic Systems: 1 fractional works · 0.2% of its workSmaller subfields together: 2 fractional works · 0.5% of its workImmunology and Microbiology: 2 fractional works · 0.7% of its workImmunology: 1 fractional works · 0.5% of its workSmaller subfields together: 1 fractional works · 0.3% of its workPharmacology, Toxicology and Pharmaceutics: 0 fractional works · 0.1% of its workALL ITS WORKPemex (Mexico)297fractional works, 2022-now
Life Sciences8%Physical Sciences24%Health Sciences54%Social Sciences14%

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. Medicine14950.0%
    2. Health Professions82.7%
    3. Dentistry20.6%
    4. Veterinary10.2%
    5. Nursing00.0%
    1. Engineering3612.1%
    2. Earth and Planetary Sciences165.3%
    3. Environmental Science93.1%
    4. Computer Science51.8%
    5. Physics and Astronomy20.6%
    6. Materials Science20.5%
    7. Chemistry10.4%
    8. Mathematics10.3%
    9. Energy10.2%
    10. Chemical Engineering00.1%
    1. Social Sciences247.9%
    2. Economics, Econometrics and Finance51.8%
    3. Arts and Humanities51.6%
    4. Psychology41.4%
    5. Business, Management and Accounting31.0%
    6. Decision Sciences00.0%
    1. Biochemistry, Genetics and Molecular Biology134.3%
    2. Agricultural and Biological Sciences62.1%
    3. Neuroscience41.3%
    4. Immunology and Microbiology20.7%
    5. Pharmacology, Toxicology and Pharmaceutics00.1%
All of science, and how each field's share has moved since 1950: the Science domain explorer

What does Pemex (Mexico) specialise in?

Where its research is concentrated relative to its size: Surgery takes 6.6× the share of its output that it takes of world research.

  1. SurgerySubfield · 45.7 works6.6×
← 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: 0.44× its world share, 6 worksAgricultural and Bio…Biochemistry, Genetics and Molecular Biology: 0.80× its world share, 13 worksBiochemistry, Geneti…Immunology and Microbiology: 0.72× its world share, 2 worksImmunology and Micro…Neuroscience: 0.83× its world share, 4 worksNeurosciencePharmacology, Toxicology and Pharmaceutics: 0.19× its world share, 0 worksPharmacology, Toxico…Chemical Engineering: 0.16× its world share, 0 worksChemical EngineeringChemistry: 0.26× its world share, 1 worksChemistryComputer Science: 0.23× its world share, 5 worksComputer ScienceEarth and Planetary Sciences: 3.35× its world share, 16 worksEarth and Planetary …Energy: 0.21× its world share, 1 worksEnergyEngineering: 0.80× its world share, 36 worksEngineeringEnvironmental Science: 0.62× its world share, 9 worksEnvironmental ScienceMaterials Science: 0.15× its world share, 2 worksMaterials ScienceMathematics: 0.27× its world share, 1 worksMathematicsPhysics and Astronomy: 0.28× its world share, 2 worksPhysics and AstronomyDentistry: 1.15× its world share, 2 worksDentistryHealth Professions: 1.02× its world share, 8 worksHealth ProfessionsMedicine: 2.60× its world share, 149 worksMedicineNursing: 0.06× its world share, 0 worksNursingVeterinary: 1.65× its world share, 1 worksVeterinaryArts and Humanities: 0.55× its world share, 5 worksArts and HumanitiesBusiness, Management and Accounting: 0.32× its world share, 3 worksBusiness, Management…Decision Sciences: 0.02× its world share, 0 worksDecision SciencesEconomics, Econometrics and Finance: 0.84× its world share, 5 worksEconomics, Econometr…Psychology: 0.45× its world share, 4 worksPsychologySocial Sciences: 0.63× its world share, 24 worksSocial Sciences1×world share
more than its size predictsabout as predictedless

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

All 26 fields, with their numbers
  1. Earth and Planetary Sciences3.35×16 works
  2. Medicine2.60×149 works
  3. Veterinary1.65×1 works
  4. Dentistry1.15×2 works
  5. Health Professions1.02×8 works
  6. Economics, Econometrics and Finance0.84×5 works
  7. Neuroscience0.83×4 works
  8. Biochemistry, Genetics and Molecular Biology0.80×13 works
  9. Engineering0.80×36 works
  10. Immunology and Microbiology0.72×2 works
  11. Social Sciences0.63×24 works
  12. Environmental Science0.62×9 works
  13. Arts and Humanities0.55×5 works
  14. Psychology0.45×4 works
  15. Agricultural and Biological Sciences0.44×6 works
  16. Business, Management and Accounting0.32×3 works
  17. Physics and Astronomy0.28×2 works
  18. Mathematics0.27×1 works
  19. Chemistry0.26×1 works
  20. Computer Science0.23×5 works
  21. Energy0.21×1 works
  22. Pharmacology, Toxicology and Pharmaceutics0.19×0 works
  23. Chemical Engineering0.16×0 works
  24. Materials Science0.15×2 works
  25. Nursing0.06×0 works
  26. Decision Sciences0.02×0 works

Who are the top researchers at Pemex (Mexico)?

Ranked on the quality score, Rafael Herrera, Héber Cinco-Ley and H. Cinco-Ley lead among researchers whose main affiliation is Pemex (Mexico).

  1. 1 Rafael Herrera Mexico · #1,209,819 worldwide 533 citations · 42 works
  2. 2 Héber Cinco-Ley Mexico · #1,604,070 worldwide 2k citations · 45 works
  3. 3 H. Cinco-Ley Mexico · #2,051,833 worldwide 912 citations · 36 works
  4. 4 M. Vásquez-Cruz Mexico · #2,468,545 worldwide 472 citations · 19 works
  5. 5 José David Simonin López Mexico · #2,827,126 worldwide 446 citations · 22 works
  6. 6 Fernando Samaniego-V. Mexico · #3,128,373 worldwide 1.3k citations · 33 works
  7. 7 Guillermo Hideo Wakida-Kusunoki Mexico · #3,139,030 worldwide 215 citations · 17 works
  8. 8 Gorgonio Fuentes-Cruz Mexico · #3,407,179 worldwide 416 citations · 32 works
  9. 9 J. García-Hernández Mexico · #3,526,758 worldwide 260 citations · 16 works
  10. 10 Efraín Méndez‐Hernández Mexico · #3,680,311 worldwide 196 citations · 17 works
All ranked researchers at Pemex (Mexico)

What are the most cited papers from Pemex (Mexico)?

The most cited paper from Pemex (Mexico) is "Chicxulub Crater: A possible Cretaceous/Tertiary boundary impact crater on the Yucatán Peninsula, Mexico" (A. R. Hildebrand, Glen T. Penfield, David A. KRING et al., 1991), with 962 citations. Next come "Transportation of heavy and extra-heavy crude oil by pipeline: A review" (678) and "Solid state fermentation (SSF): diversity of applications to valorize waste and biomass" (212).

Most cited papers
#PaperReleasedCitations
1 Chicxulub Crater: A possible Cretaceous/Tertiary boundary impact crater on the Yucatán Peninsula, Mexico A. R. Hildebrand, Glen T. Penfield, David A. KRING et al. · Geology 1991 962
2 Transportation of heavy and extra-heavy crude oil by pipeline: A review Rafael Martínez‐Palou, M.L. Mosqueira, Beatriz Zapata-Rendón et al. · Journal of Petroleum Science and Engineering 27 Nov 2010 678
3 Solid state fermentation (SSF): diversity of applications to valorize waste and biomass Manuel Alejandro Lizardi Jiménez, R. Martı́nez · 3 Biotech Open access 25 Apr 2017 212
4 Transient Pressure Analysis: Finite Conductivity Fracture Case Versus Damaged Fracture Case Héber Cinco-Ley, Fernando Samaniego-V. · SPE Annual Technical Conference and Exhibition Conference paper 4 Oct 1981 189
5 Pressure Transient Analysis of Wells with Finite Conductivity Vertical Fractures in Double Porosity Reservoirs H. Cinco-Ley, Hongyu Meng · SPE Annual Technical Conference and Exhibition Conference paper 2 Oct 1988 176
All 60 most cited papers, with filters and sorting

Which keywords describe research at Pemex (Mexico)?

By fractional works in 2022-now, weighted toward what it does more of than the world: Epidemiology, Complications, Treatment, Geophysical Imaging, Diagnosis, Full-Waveform Tomography, Seismic Waveform Inversion and Data Assimilation.

▲ 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. Epidemiology29▲ 2.5×77 topics
  2. Complications16▲ 11×16 topics
  3. Treatment13▲ 3.5×33 topics
  4. Quality of Life11▲ 2.6×28 topics
  5. Diagnosis11▲ 3.9×27 topics
  6. Inflammation10▲ 1.62×33 topics
  7. Management9▲ 3.7×21 topics
  8. Geophysical Imaging8▲ 50×2 topics
  9. Surgical Management8▲ 6.4×16 topics
  10. Full-Waveform Tomography8▲ 61×1 topic
  11. Seismic Waveform Inversion8▲ 61×1 topic
  12. Optimization7▲ 5.6×3 topics
  13. Data Assimilation7▲ 14×1 topic
  14. Ensemble Kalman Filter7▲ 23×1 topic
  15. Genetic Mutations7▲ 5.2×19 topics
  16. Breast Reconstruction7▲ 36×2 topics
  17. Hydraulic Fracturing6▲ 21×1 topic
  18. Shale Gas Reservoirs6▲ 37×1 topic
  19. Prognostic Factors6▲ 4.7×14 topics
  20. Radiotherapy6▲ 5.2×10 topics
  21. Guidelines6▲ 4.1×8 topics
  22. CO2 Sequestration6▲ 9.4×3 topics
  23. Drilling Fluids5▲ 32×1 topic
  24. Urban Development5▲ 4.7×4 topics
  25. Well Integrity5▲ 32×1 topic
  26. Reconstruction5▲ 9.5×3 topics
  27. Anatomy5▲ 21×2 topics
  28. Chronic Kidney Disease4▲ 5.8×8 topics
  29. Wound Healing4▲ 5.3×5 topics
  30. Tomography4▲ 7.8×2 topics
  31. Seismic Noise4▲ 28×1 topic
  32. Surface Wave4▲ 28×1 topic
  33. Clinical Management4▲ 7.7×5 topics
  34. Free Flap4▲ 31×1 topic
  35. Microsurgical Reconstruction4▲ 31×1 topic
  36. Porous Media4▲ 9.3×2 topics
  37. Craniofacial4▲ 51×1 topic
  38. Nasal4▲ 21×1 topic
  39. Postoperative Complications4▲ 9.6×4 topics
  40. Pore Structure3▲ 9.1×2 topics

Which research topics does Pemex (Mexico) publish most on?

By volume in 2022-now: Seismic Imaging and Inversion Techniques, Reservoir Engineering and Simulation Methods, Hydraulic Fracturing and Reservoir Analysis and Drilling and Well Engineering.

Seismic Imaging and Inversion Techniques: 8 fractional worksReservoir Engineering and Simulation Methods: 7 fractional worksHydraulic Fracturing and…6Hydraulic Fracturing and Reservoir Analysis: 6 fractional worksDrilling and Well Engine…5Drilling and Well Engineering: 5 fractional worksSeismic Waves and Analysis: 4 fractional worksReconstructive Surgery and Microvascular Techniques: 4 fractional worksReconstructive Facial Su…4Reconstructive Facial Surgery Techniques: 4 fractional worksHydrocarbon exploration and reservoir analysis: 3 fractional worksEnhanced Oil Recovery Techniques: 3 fractional worksBreast Implant and Reconstruction: 3 fractional works
GeophysicsOcean EngineeringMechanical EngineeringSurgery1 others

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

  1. 1 Seismic Imaging and Inversion Techniques Geophysics 8 works
  2. 2 Reservoir Engineering and Simulation Methods Ocean Engineering 7 works
  3. 3 Hydraulic Fracturing and Reservoir Analysis Mechanical Engineering 6 works
  4. 4 Drilling and Well Engineering Ocean Engineering 5 works
  5. 5 Seismic Waves and Analysis Geophysics 4 works
  6. 6 Reconstructive Surgery and Microvascular Techniques Surgery 4 works
  7. 7 Reconstructive Facial Surgery Techniques Surgery 4 works
  8. 8 Hydrocarbon exploration and reservoir analysis Mechanics of Materials 3 works
  9. 9 Enhanced Oil Recovery Techniques Ocean Engineering 3 works
  10. 10 Breast Implant and Reconstruction Surgery 3 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 available28.4%not open71.6%

World: 40% of research is openly available.

with international co-authors29.2%domestic only70.8%

World: 18% is written across borders.

How has Pemex (Mexico)'s research output changed?

Output in 2022-2025 was 14% 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 Pemex (Mexico) as a percentage of every work published that year, 0.0013% in 2024.

still counting0.0020%0.0040%0.0060%Pemex (Mexico)0.00092% in 202519801990200020102020

Fractional works of Pemex (Mexico) 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 2025Pemex (Mexico)3.5% in 2025200020102020

Of each year's output, the share that reached the world's 10% most cited for its field and year. Peak 4.9% in 2008.

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Pemex (Mexico) on Science Explorer

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