Max Planck Institute for Radio Astronomy

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Max Planck Institute for Radio Astronomy

Short name

MPIfRA

Country, city

Germany, Bonn

04jvemc39

Organization website

Publications

6 373

Citations

246 232

h-index

195

Top-3 journals

Astronomy and Astrophysics (1646 publications)

Astrophysical Journal (1028 publications)

Monthly Notices of the Royal Astronomical Society (1009 publications)

Top-3 organizations

National Institute for Astrophysics (663 publications)

Center for Astrophysics | Harvard & Smithsonian (603 publications)

California Institute of Technology (590 publications)

Top-3 foreign organizations

National Institute for Astrophysics (663 publications)

Center for Astrophysics | Harvard & Smithsonian (603 publications)

California Institute of Technology (590 publications)

Most cited in 5 years

Found

Publication title

Publisher

Journal

Field of science

Countries

Found

Since 1967

Total publications

6373

Total citations

246232

Citations per publication

38.64

Average publications per year

108.02

Average authors per publication

12.2

h-index

195

Metrics description

h-index

A scientist has an h-index if h of his N publications are cited at least h times each, while the remaining (N - h) publications are cited no more than h times each.

https://www.pnas.org/doi/full/10.1073/pnas.0507655102

Top-30

Fields of science

	500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Astronomy and Astrophysics	Astronomy and Astrophysics, 4782, 75.04% Astronomy and Astrophysics 4782 publications, 75.04%
Space and Planetary Science	Space and Planetary Science, 4629, 72.63% Space and Planetary Science 4629 publications, 72.63%
General Physics and Astronomy	General Physics and Astronomy, 175, 2.75% General Physics and Astronomy 175 publications, 2.75%
Multidisciplinary	Multidisciplinary, 160, 2.51% Multidisciplinary 160 publications, 2.51%
General Medicine	General Medicine, 132, 2.07% General Medicine 132 publications, 2.07%
Electrical and Electronic Engineering	Electrical and Electronic Engineering, 74, 1.16% Electrical and Electronic Engineering 74 publications, 1.16%
General Engineering	General Engineering, 67, 1.05% General Engineering 67 publications, 1.05%
Condensed Matter Physics	Condensed Matter Physics, 59, 0.93% Condensed Matter Physics 59 publications, 0.93%
Atomic and Molecular Physics, and Optics	Atomic and Molecular Physics, and Optics, 58, 0.91% Atomic and Molecular Physics, and Optics 58 publications, 0.91%
Instrumentation	Instrumentation, 51, 0.8% Instrumentation 51 publications, 0.8%
Physics and Astronomy (miscellaneous)	Physics and Astronomy (miscellaneous), 41, 0.64% Physics and Astronomy (miscellaneous) 41 publications, 0.64%
Physical and Theoretical Chemistry	Physical and Theoretical Chemistry, 40, 0.63% Physical and Theoretical Chemistry 40 publications, 0.63%
General Earth and Planetary Sciences	General Earth and Planetary Sciences, 39, 0.61% General Earth and Planetary Sciences 39 publications, 0.61%
Nuclear and High Energy Physics	Nuclear and High Energy Physics, 35, 0.55% Nuclear and High Energy Physics 35 publications, 0.55%
Geophysics	Geophysics, 34, 0.53% Geophysics 34 publications, 0.53%
Radiation	Radiation, 31, 0.49% Radiation 31 publications, 0.49%
Mathematical Physics	Mathematical Physics, 28, 0.44% Mathematical Physics 28 publications, 0.44%
Atmospheric Science	Atmospheric Science, 28, 0.44% Atmospheric Science 28 publications, 0.44%
Spectroscopy	Spectroscopy, 19, 0.3% Spectroscopy 19 publications, 0.3%
Aerospace Engineering	Aerospace Engineering, 17, 0.27% Aerospace Engineering 17 publications, 0.27%
Electronic, Optical and Magnetic Materials	Electronic, Optical and Magnetic Materials, 16, 0.25% Electronic, Optical and Magnetic Materials 16 publications, 0.25%
General Environmental Science	General Environmental Science, 11, 0.17% General Environmental Science 11 publications, 0.17%
Earth and Planetary Sciences (miscellaneous)	Earth and Planetary Sciences (miscellaneous), 11, 0.17% Earth and Planetary Sciences (miscellaneous) 11 publications, 0.17%
General Biochemistry, Genetics and Molecular Biology	General Biochemistry, Genetics and Molecular Biology, 9, 0.14% General Biochemistry, Genetics and Molecular Biology 9 publications, 0.14%
History	History, 9, 0.14% History 9 publications, 0.14%
Geochemistry and Petrology	Geochemistry and Petrology, 8, 0.13% Geochemistry and Petrology 8 publications, 0.13%
History and Philosophy of Science	History and Philosophy of Science, 8, 0.13% History and Philosophy of Science 8 publications, 0.13%
General Chemistry	General Chemistry, 7, 0.11% General Chemistry 7 publications, 0.11%
General Neuroscience	General Neuroscience, 6, 0.09% General Neuroscience 6 publications, 0.09%
Ecology, Evolution, Behavior and Systematics	Ecology, Evolution, Behavior and Systematics, 6, 0.09% Ecology, Evolution, Behavior and Systematics 6 publications, 0.09%
	500 1000 1500 2000 2500 3000 3500 4000 4500 5000

Journals

	200 400 600 800 1000 1200 1400 1600 1800
Astronomy and Astrophysics	Astronomy and Astrophysics, 1646, 25.83% Astronomy and Astrophysics 1646 publications, 25.83%
Astrophysical Journal	Astrophysical Journal, 1028, 16.13% Astrophysical Journal 1028 publications, 16.13%
Monthly Notices of the Royal Astronomical Society	Monthly Notices of the Royal Astronomical Society, 1009, 15.83% Monthly Notices of the Royal Astronomical Society 1009 publications, 15.83%
Proceedings of the International Astronomical Union	Proceedings of the International Astronomical Union, 250, 3.92% Proceedings of the International Astronomical Union 250 publications, 3.92%
Symposium - International Astronomical Union	Symposium - International Astronomical Union, 246, 3.86% Symposium - International Astronomical Union 246 publications, 3.86%
Astrophysical Journal Letters	Astrophysical Journal Letters, 145, 2.28% Astrophysical Journal Letters 145 publications, 2.28%
Proceedings of SPIE - The International Society for Optical Engineering	Proceedings of SPIE - The International Society for Optical Engineering, 136, 2.13% Proceedings of SPIE - The International Society for Optical Engineering 136 publications, 2.13%
Nature	Nature, 115, 1.8% Nature 115 publications, 1.8%
Astronomical Journal	Astronomical Journal, 102, 1.6% Astronomical Journal 102 publications, 1.6%
Astrophysics and Space Science Library	Astrophysics and Space Science Library, 94, 1.47% Astrophysics and Space Science Library 94 publications, 1.47%
Astrophysical Journal, Supplement Series	Astrophysical Journal, Supplement Series, 72, 1.13% Astrophysical Journal, Supplement Series 72 publications, 1.13%
International Astronomical Union Colloquium	International Astronomical Union Colloquium, 72, 1.13% International Astronomical Union Colloquium 72 publications, 1.13%
Monthly Notices of the Royal Astronomical Society: Letters	Monthly Notices of the Royal Astronomical Society: Letters, 63, 0.99% Monthly Notices of the Royal Astronomical Society: Letters 63 publications, 0.99%
Astronomy and Astrophysics Library	Astronomy and Astrophysics Library, 60, 0.94% Astronomy and Astrophysics Library 60 publications, 0.94%
Journal of Physics: Conference Series	Journal of Physics: Conference Series, 59, 0.93% Journal of Physics: Conference Series 59 publications, 0.93%
Astrophysics and Space Science	Astrophysics and Space Science, 59, 0.93% Astrophysics and Space Science 59 publications, 0.93%
Galaxies	Galaxies, 48, 0.75% Galaxies 48 publications, 0.75%
Nature Astronomy	Nature Astronomy, 48, 0.75% Nature Astronomy 48 publications, 0.75%
Publications of the Astronomical Society of Australia	Publications of the Astronomical Society of Australia, 47, 0.74% Publications of the Astronomical Society of Australia 47 publications, 0.74%
Astronomische Nachrichten	Astronomische Nachrichten, 46, 0.72% Astronomische Nachrichten 46 publications, 0.72%
EAS Publications Series	EAS Publications Series, 40, 0.63% EAS Publications Series 40 publications, 0.63%
Science	Science, 36, 0.56% Science 36 publications, 0.56%
New Astronomy Reviews	New Astronomy Reviews, 32, 0.5% New Astronomy Reviews 32 publications, 0.5%
Physical Review D	Physical Review D, 32, 0.5% Physical Review D 32 publications, 0.5%
Astronomy and Astrophysics Supplement Series	Astronomy and Astrophysics Supplement Series, 29, 0.46% Astronomy and Astrophysics Supplement Series 29 publications, 0.46%
Eso Astrophysics Symposia	Eso Astrophysics Symposia, 28, 0.44% Eso Astrophysics Symposia 28 publications, 0.44%
Solar Physics	Solar Physics, 25, 0.39% Solar Physics 25 publications, 0.39%
Red Giants as Probes of the Structure and Evolution of the Milky Way	Red Giants as Probes of the Structure and Evolution of the Milky Way, 24, 0.38% Red Giants as Probes of the Structure and Evolution of the Milky Way 24 publications, 0.38%
Journal of Cosmology and Astroparticle Physics	Journal of Cosmology and Astroparticle Physics, 20, 0.31% Journal of Cosmology and Astroparticle Physics 20 publications, 0.31%
Publication of the Astronomical Society of Japan	Publication of the Astronomical Society of Japan, 19, 0.3% Publication of the Astronomical Society of Japan 19 publications, 0.3%
	200 400 600 800 1000 1200 1400 1600 1800

Publishers

	200 400 600 800 1000 1200 1400 1600 1800
EDP Sciences	EDP Sciences, 1735, 27.22% EDP Sciences 1735 publications, 27.22%
American Astronomical Society	American Astronomical Society, 1261, 19.79% American Astronomical Society 1261 publications, 19.79%
Oxford University Press	Oxford University Press, 1094, 17.17% Oxford University Press 1094 publications, 17.17%
Cambridge University Press	Cambridge University Press, 641, 10.06% Cambridge University Press 641 publications, 10.06%
Springer Nature	Springer Nature, 617, 9.68% Springer Nature 617 publications, 9.68%
IOP Publishing	IOP Publishing, 247, 3.88% IOP Publishing 247 publications, 3.88%
Elsevier	Elsevier, 167, 2.62% Elsevier 167 publications, 2.62%
SPIE-Intl Soc Optical Eng	SPIE-Intl Soc Optical Eng, 139, 2.18% SPIE-Intl Soc Optical Eng 139 publications, 2.18%
Wiley	Wiley, 70, 1.1% Wiley 70 publications, 1.1%
MDPI	MDPI, 66, 1.04% MDPI 66 publications, 1.04%
American Physical Society (APS)	American Physical Society (APS), 50, 0.78% American Physical Society (APS) 50 publications, 0.78%
American Association for the Advancement of Science (AAAS)	American Association for the Advancement of Science (AAAS), 42, 0.66% American Association for the Advancement of Science (AAAS) 42 publications, 0.66%
Institute of Electrical and Electronics Engineers (IEEE)	Institute of Electrical and Electronics Engineers (IEEE), 39, 0.61% Institute of Electrical and Electronics Engineers (IEEE) 39 publications, 0.61%
AIP Publishing	AIP Publishing, 35, 0.55% AIP Publishing 35 publications, 0.55%
Pleiades Publishing	Pleiades Publishing, 34, 0.53% Pleiades Publishing 34 publications, 0.53%
World Scientific	World Scientific, 24, 0.38% World Scientific 24 publications, 0.38%
Institution of Engineering and Technology (IET)	Institution of Engineering and Technology (IET), 17, 0.27% Institution of Engineering and Technology (IET) 17 publications, 0.27%
Optica Publishing Group	Optica Publishing Group, 15, 0.24% Optica Publishing Group 15 publications, 0.24%
Walter de Gruyter	Walter de Gruyter, 12, 0.19% Walter de Gruyter 12 publications, 0.19%
Copernicus	Copernicus, 8, 0.13% Copernicus 8 publications, 0.13%
Science in China Press	Science in China Press, 8, 0.13% Science in China Press 8 publications, 0.13%
Taylor & Francis	Taylor & Francis, 6, 0.09% Taylor & Francis 6 publications, 0.09%
China Science Publishing & Media	China Science Publishing & Media, 6, 0.09% China Science Publishing & Media 6 publications, 0.09%
American Geophysical Union	American Geophysical Union, 5, 0.08% American Geophysical Union 5 publications, 0.08%
Annual Reviews	Annual Reviews, 5, 0.08% Annual Reviews 5 publications, 0.08%
American Chemical Society (ACS)	American Chemical Society (ACS), 4, 0.06% American Chemical Society (ACS) 4 publications, 0.06%
Royal Society of Chemistry (RSC)	Royal Society of Chemistry (RSC), 4, 0.06% Royal Society of Chemistry (RSC) 4 publications, 0.06%
Uspekhi Fizicheskikh Nauk Journal	Uspekhi Fizicheskikh Nauk Journal, 4, 0.06% Uspekhi Fizicheskikh Nauk Journal 4 publications, 0.06%
Frontiers Media S.A.	Frontiers Media S.A., 3, 0.05% Frontiers Media S.A. 3 publications, 0.05%
The Royal Society	The Royal Society, 3, 0.05% The Royal Society 3 publications, 0.05%
	200 400 600 800 1000 1200 1400 1600 1800

With other organizations

	100 200 300 400 500 600 700
National Institute for Astrophysics	National Institute for Astrophysics, 663, 10.4% National Institute for Astrophysics 663 publications, 10.4%
Center for Astrophysics \| Harvard & Smithsonian	Center for Astrophysics \| Harvard & Smithsonian, 603, 9.46% Center for Astrophysics \| Harvard & Smithsonian 603 publications, 9.46%
California Institute of Technology	California Institute of Technology, 590, 9.26% California Institute of Technology 590 publications, 9.26%
University of Manchester	University of Manchester, 588, 9.23% University of Manchester 588 publications, 9.23%
Max Planck Institute for Astronomy	Max Planck Institute for Astronomy, 497, 7.8% Max Planck Institute for Astronomy 497 publications, 7.8%
University of Cologne	University of Cologne, 469, 7.36% University of Cologne 469 publications, 7.36%
Commonwealth Scientific and Industrial Research Organization	Commonwealth Scientific and Industrial Research Organization, 444, 6.97% Commonwealth Scientific and Industrial Research Organization 444 publications, 6.97%
Netherlands Institute for Radio Astronomy	Netherlands Institute for Radio Astronomy, 416, 6.53% Netherlands Institute for Radio Astronomy 416 publications, 6.53%
Rhenish Friedrich Wilhelm University of Bonn	Rhenish Friedrich Wilhelm University of Bonn, 411, 6.45% Rhenish Friedrich Wilhelm University of Bonn 411 publications, 6.45%
Observatoire de Paris	Observatoire de Paris, 410, 6.43% Observatoire de Paris 410 publications, 6.43%
Leiden University	Leiden University, 325, 5.1% Leiden University 325 publications, 5.1%
European Southern Observatory	European Southern Observatory, 270, 4.24% European Southern Observatory 270 publications, 4.24%
Astronomical Observatory of Cagliari	Astronomical Observatory of Cagliari, 265, 4.16% Astronomical Observatory of Cagliari 265 publications, 4.16%
University of Arizona	University of Arizona, 264, 4.14% University of Arizona 264 publications, 4.14%
University of Amsterdam	University of Amsterdam, 261, 4.1% University of Amsterdam 261 publications, 4.1%
Arcetri Astrophysical Observatory	Arcetri Astrophysical Observatory, 246, 3.86% Arcetri Astrophysical Observatory 246 publications, 3.86%
National Astronomical Observatories, Chinese Academy of Sciences	National Astronomical Observatories, Chinese Academy of Sciences, 246, 3.86% National Astronomical Observatories, Chinese Academy of Sciences 246 publications, 3.86%
Radboud University Nijmegen	Radboud University Nijmegen, 244, 3.83% Radboud University Nijmegen 244 publications, 3.83%
Goddard Space Flight Center	Goddard Space Flight Center, 237, 3.72% Goddard Space Flight Center 237 publications, 3.72%
Jet Propulsion Laboratory	Jet Propulsion Laboratory, 231, 3.62% Jet Propulsion Laboratory 231 publications, 3.62%
Sorbonne University	Sorbonne University, 228, 3.58% Sorbonne University 228 publications, 3.58%
Paris Cité University	Paris Cité University, 227, 3.56% Paris Cité University 227 publications, 3.56%
Chalmers University of Technology	Chalmers University of Technology, 224, 3.51% Chalmers University of Technology 224 publications, 3.51%
University of Maryland, College Park	University of Maryland, College Park, 212, 3.33% University of Maryland, College Park 212 publications, 3.33%
P.N. Lebedev Physical Institute of the Russian Academy of Sciences	P.N. Lebedev Physical Institute of the Russian Academy of Sciences, 206, 3.23% P.N. Lebedev Physical Institute of the Russian Academy of Sciences 206 publications, 3.23%
Swinburne University of Technology	Swinburne University of Technology, 205, 3.22% Swinburne University of Technology 205 publications, 3.22%
National Astronomical Observatory of Japan	National Astronomical Observatory of Japan, 204, 3.2% National Astronomical Observatory of Japan 204 publications, 3.2%
Institute for Radio Astronomy of Bologna	Institute for Radio Astronomy of Bologna, 201, 3.15% Institute for Radio Astronomy of Bologna 201 publications, 3.15%
National Autonomous University of Mexico	National Autonomous University of Mexico, 193, 3.03% National Autonomous University of Mexico 193 publications, 3.03%
Cornell University	Cornell University, 189, 2.97% Cornell University 189 publications, 2.97%
	100 200 300 400 500 600 700

With foreign organizations

	100 200 300 400 500 600 700
National Institute for Astrophysics	National Institute for Astrophysics, 663, 10.4% National Institute for Astrophysics 663 publications, 10.4%
Center for Astrophysics \| Harvard & Smithsonian	Center for Astrophysics \| Harvard & Smithsonian, 603, 9.46% Center for Astrophysics \| Harvard & Smithsonian 603 publications, 9.46%
California Institute of Technology	California Institute of Technology, 590, 9.26% California Institute of Technology 590 publications, 9.26%
University of Manchester	University of Manchester, 588, 9.23% University of Manchester 588 publications, 9.23%
Commonwealth Scientific and Industrial Research Organization	Commonwealth Scientific and Industrial Research Organization, 444, 6.97% Commonwealth Scientific and Industrial Research Organization 444 publications, 6.97%
Netherlands Institute for Radio Astronomy	Netherlands Institute for Radio Astronomy, 416, 6.53% Netherlands Institute for Radio Astronomy 416 publications, 6.53%
Observatoire de Paris	Observatoire de Paris, 410, 6.43% Observatoire de Paris 410 publications, 6.43%
Leiden University	Leiden University, 325, 5.1% Leiden University 325 publications, 5.1%
Astronomical Observatory of Cagliari	Astronomical Observatory of Cagliari, 265, 4.16% Astronomical Observatory of Cagliari 265 publications, 4.16%
University of Arizona	University of Arizona, 264, 4.14% University of Arizona 264 publications, 4.14%
University of Amsterdam	University of Amsterdam, 261, 4.1% University of Amsterdam 261 publications, 4.1%
Arcetri Astrophysical Observatory	Arcetri Astrophysical Observatory, 246, 3.86% Arcetri Astrophysical Observatory 246 publications, 3.86%
National Astronomical Observatories, Chinese Academy of Sciences	National Astronomical Observatories, Chinese Academy of Sciences, 246, 3.86% National Astronomical Observatories, Chinese Academy of Sciences 246 publications, 3.86%
Radboud University Nijmegen	Radboud University Nijmegen, 244, 3.83% Radboud University Nijmegen 244 publications, 3.83%
Goddard Space Flight Center	Goddard Space Flight Center, 237, 3.72% Goddard Space Flight Center 237 publications, 3.72%
Jet Propulsion Laboratory	Jet Propulsion Laboratory, 231, 3.62% Jet Propulsion Laboratory 231 publications, 3.62%
Sorbonne University	Sorbonne University, 228, 3.58% Sorbonne University 228 publications, 3.58%
Paris Cité University	Paris Cité University, 227, 3.56% Paris Cité University 227 publications, 3.56%
Chalmers University of Technology	Chalmers University of Technology, 224, 3.51% Chalmers University of Technology 224 publications, 3.51%
University of Maryland, College Park	University of Maryland, College Park, 212, 3.33% University of Maryland, College Park 212 publications, 3.33%
P.N. Lebedev Physical Institute of the Russian Academy of Sciences	P.N. Lebedev Physical Institute of the Russian Academy of Sciences, 206, 3.23% P.N. Lebedev Physical Institute of the Russian Academy of Sciences 206 publications, 3.23%
Swinburne University of Technology	Swinburne University of Technology, 205, 3.22% Swinburne University of Technology 205 publications, 3.22%
National Astronomical Observatory of Japan	National Astronomical Observatory of Japan, 204, 3.2% National Astronomical Observatory of Japan 204 publications, 3.2%
Institute for Radio Astronomy of Bologna	Institute for Radio Astronomy of Bologna, 201, 3.15% Institute for Radio Astronomy of Bologna 201 publications, 3.15%
National Autonomous University of Mexico	National Autonomous University of Mexico, 193, 3.03% National Autonomous University of Mexico 193 publications, 3.03%
Cornell University	Cornell University, 189, 2.97% Cornell University 189 publications, 2.97%
University of California, Berkeley	University of California, Berkeley, 189, 2.97% University of California, Berkeley 189 publications, 2.97%
University of British Columbia	University of British Columbia, 185, 2.9% University of British Columbia 185 publications, 2.9%
Paris Sciences et Lettres	Paris Sciences et Lettres, 183, 2.87% Paris Sciences et Lettres 183 publications, 2.87%
West Virginia University	West Virginia University, 178, 2.79% West Virginia University 178 publications, 2.79%
	100 200 300 400 500 600 700

With other countries

	500 1000 1500 2000 2500 3000
USA	USA, 2904, 45.57% USA 2904 publications, 45.57%
United Kingdom	United Kingdom, 1435, 22.52% United Kingdom 1435 publications, 22.52%
France	France, 1183, 18.56% France 1183 publications, 18.56%
Netherlands	Netherlands, 1054, 16.54% Netherlands 1054 publications, 16.54%
Italy	Italy, 982, 15.41% Italy 982 publications, 15.41%
Australia	Australia, 784, 12.3% Australia 784 publications, 12.3%
Spain	Spain, 783, 12.29% Spain 783 publications, 12.29%
China	China, 778, 12.21% China 778 publications, 12.21%
Canada	Canada, 706, 11.08% Canada 706 publications, 11.08%
Chile	Chile, 506, 7.94% Chile 506 publications, 7.94%
Russia	Russia, 485, 7.61% Russia 485 publications, 7.61%
Japan	Japan, 397, 6.23% Japan 397 publications, 6.23%
Sweden	Sweden, 301, 4.72% Sweden 301 publications, 4.72%
Mexico	Mexico, 262, 4.11% Mexico 262 publications, 4.11%
Poland	Poland, 254, 3.99% Poland 254 publications, 3.99%
South Africa	South Africa, 254, 3.99% South Africa 254 publications, 3.99%
India	India, 232, 3.64% India 232 publications, 3.64%
Finland	Finland, 182, 2.86% Finland 182 publications, 2.86%
Republic of Korea	Republic of Korea, 158, 2.48% Republic of Korea 158 publications, 2.48%
Saudi Arabia	Saudi Arabia, 158, 2.48% Saudi Arabia 158 publications, 2.48%
Greece	Greece, 133, 2.09% Greece 133 publications, 2.09%
Belgium	Belgium, 131, 2.06% Belgium 131 publications, 2.06%
Switzerland	Switzerland, 112, 1.76% Switzerland 112 publications, 1.76%
Czech Republic	Czech Republic, 108, 1.69% Czech Republic 108 publications, 1.69%
Denmark	Denmark, 106, 1.66% Denmark 106 publications, 1.66%
Ireland	Ireland, 106, 1.66% Ireland 106 publications, 1.66%
Brazil	Brazil, 96, 1.51% Brazil 96 publications, 1.51%
Hungary	Hungary, 96, 1.51% Hungary 96 publications, 1.51%
Portugal	Portugal, 70, 1.1% Portugal 70 publications, 1.1%
	500 1000 1500 2000 2500 3000

We do not take into account publications without a DOI.
Statistics recalculated daily.
Publications published earlier than 1967 are ignored in the statistics.
The horizontal charts show the 30 top positions.
Journals quartiles values are relevant at the moment.