Open Access
Open access

International Journal of Ceramic Engineering & Science

Wiley
Wiley
ISSN: 25783270

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SCImago
Q3
WOS
Q3
Impact factor
1.2
SJR
0.293
CiteScore
2.0
Categories
Ceramics and Composites
Electronic, Optical and Magnetic Materials
Materials Science (miscellaneous)
Biomaterials
Areas
Materials Science
Years of issue
2019-2025
journal names
International Journal of Ceramic Engineering & Science
Publications
240
Citations
1 115
h-index
15
Publications
212
Citations
1 082
Top-3 citing journals
Top-3 organizations
Top-3 countries
USA (67 publications)
China (31 publications)
Germany (28 publications)
USA (50 publications)
Germany (25 publications)
Brazil (18 publications)

Most cited in 5 years

Found 
Found 

Top-100

Citing journals

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50
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70
80
90
Ceramics International
89 citations, 7.98%
Journal of the European Ceramic Society
65 citations, 5.83%
Journal of the American Ceramic Society
52 citations, 4.66%
International Journal of Applied Ceramic Technology
29 citations, 2.6%
International Journal of Ceramic Engineering & Science
29 citations, 2.6%
Open Ceramics
26 citations, 2.33%
Materials
24 citations, 2.15%
Construction and Building Materials
13 citations, 1.17%
ACS applied materials & interfaces
11 citations, 0.99%
Journal of Alloys and Compounds
11 citations, 0.99%
Journal of Building Engineering
9 citations, 0.81%
Scientific Reports
9 citations, 0.81%
Journal of Advanced Ceramics
8 citations, 0.72%
Materials Chemistry and Physics
8 citations, 0.72%
Applied Sciences (Switzerland)
8 citations, 0.72%
Journal of Nuclear Materials
8 citations, 0.72%
Polymers
7 citations, 0.63%
Advanced Engineering Materials
7 citations, 0.63%
Ceramics
7 citations, 0.63%
Materials Letters
6 citations, 0.54%
International Journal of Hydrogen Energy
6 citations, 0.54%
Journal of Materials Science
6 citations, 0.54%
Chemical Engineering Journal
6 citations, 0.54%
AIP Conference Proceedings
6 citations, 0.54%
Steel Research International
6 citations, 0.54%
SID Symposium Digest of Technical Papers
6 citations, 0.54%
Molecules
5 citations, 0.45%
RSC Advances
5 citations, 0.45%
Nature Communications
5 citations, 0.45%
Journal of Materials Chemistry C
5 citations, 0.45%
Powder Technology
5 citations, 0.45%
Cement and Concrete Composites
5 citations, 0.45%
Results in Engineering
5 citations, 0.45%
Cement and Concrete Research
5 citations, 0.45%
Materials Characterization
5 citations, 0.45%
Journal of the Ceramic Society of Japan
5 citations, 0.45%
Crystals
5 citations, 0.45%
Composites - Part A: Applied Science and Manufacturing
5 citations, 0.45%
Journal of Materials Science: Materials in Electronics
5 citations, 0.45%
Journal of Cleaner Production
4 citations, 0.36%
Chemistry of Materials
4 citations, 0.36%
Case Studies in Construction Materials
4 citations, 0.36%
Materials and Design
4 citations, 0.36%
Nanomaterials
4 citations, 0.36%
Composites Part B: Engineering
4 citations, 0.36%
Materials Today Communications
4 citations, 0.36%
Surface and Coatings Technology
4 citations, 0.36%
Applied Surface Science
4 citations, 0.36%
JOM
4 citations, 0.36%
Sustainability
4 citations, 0.36%
Journal of Electronic Materials
4 citations, 0.36%
Journal of Materials Research and Technology
4 citations, 0.36%
Journal of the Australian Ceramic Society
4 citations, 0.36%
Journal of Functional Biomaterials
4 citations, 0.36%
Journal of Physics and Chemistry of Solids
4 citations, 0.36%
Processes
4 citations, 0.36%
International Journal of Refractory Metals and Hard Materials
4 citations, 0.36%
Journal of Water Process Engineering
4 citations, 0.36%
ACS Applied Electronic Materials
4 citations, 0.36%
Applications in Energy and Combustion Science
4 citations, 0.36%
Carbon
3 citations, 0.27%
Russian Journal of Inorganic Chemistry
3 citations, 0.27%
Journal of Applied Polymer Science
3 citations, 0.27%
Materials Transactions
3 citations, 0.27%
Applied Physics Letters
3 citations, 0.27%
Applied Clay Science
3 citations, 0.27%
Silicon
3 citations, 0.27%
Advanced Functional Materials
3 citations, 0.27%
ChemistrySelect
3 citations, 0.27%
Additive Manufacturing
3 citations, 0.27%
Journal of the Mechanical Behavior of Biomedical Materials
3 citations, 0.27%
Progress in Organic Coatings
3 citations, 0.27%
Journal of Energy Storage
3 citations, 0.27%
ACS Omega
3 citations, 0.27%
Colloids and Surfaces A: Physicochemical and Engineering Aspects
3 citations, 0.27%
Fuel
3 citations, 0.27%
Coatings
3 citations, 0.27%
Current Opinion in Solid State and Materials Science
3 citations, 0.27%
Journal of Asian Ceramic Societies
3 citations, 0.27%
Condensed Matter
3 citations, 0.27%
Advanced Materials Technologies
2 citations, 0.18%
Nanoscale
2 citations, 0.18%
Canadian Metallurgical Quarterly
2 citations, 0.18%
Journal of Sustainable Metallurgy
2 citations, 0.18%
Surfaces and Interfaces
2 citations, 0.18%
Materials Today Chemistry
2 citations, 0.18%
Journal of Materials Research
2 citations, 0.18%
Annual Review of Materials Research
2 citations, 0.18%
Physical Chemistry Chemical Physics
2 citations, 0.18%
Journal of Solid State Chemistry
2 citations, 0.18%
Journal of Physics: Conference Series
2 citations, 0.18%
Computational Materials Science
2 citations, 0.18%
Surface Innovations
2 citations, 0.18%
Journal of Inorganic and Organometallic Polymers and Materials
2 citations, 0.18%
International Journal of Applied Glass Science
2 citations, 0.18%
Journal of Materials Engineering and Performance
2 citations, 0.18%
Mendeleev Communications
2 citations, 0.18%
Journal of the Electrochemical Society
2 citations, 0.18%
Environmental Research
2 citations, 0.18%
Nuclear Engineering and Design
2 citations, 0.18%
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80
90

Citing publishers

50
100
150
200
250
300
350
400
450
500
Elsevier
484 citations, 43.41%
Wiley
178 citations, 15.96%
Springer Nature
114 citations, 10.22%
MDPI
98 citations, 8.79%
American Chemical Society (ACS)
37 citations, 3.32%
Royal Society of Chemistry (RSC)
28 citations, 2.51%
Taylor & Francis
18 citations, 1.61%
AIP Publishing
13 citations, 1.17%
Institute of Electrical and Electronics Engineers (IEEE)
11 citations, 0.99%
Tsinghua University Press
9 citations, 0.81%
IOP Publishing
9 citations, 0.81%
Pleiades Publishing
7 citations, 0.63%
Frontiers Media S.A.
6 citations, 0.54%
Ceramic Society of Japan
5 citations, 0.45%
Cambridge University Press
4 citations, 0.36%
Walter de Gruyter
4 citations, 0.36%
Trans Tech Publications
4 citations, 0.36%
Japan Institute of Metals
4 citations, 0.36%
American Physical Society (APS)
4 citations, 0.36%
ASME International
4 citations, 0.36%
SAGE
3 citations, 0.27%
American Institute of Aeronautics and Astronautics (AIAA)
3 citations, 0.27%
The Electrochemical Society
3 citations, 0.27%
American Society of Civil Engineers (ASCE)
3 citations, 0.27%
Emerald
2 citations, 0.18%
American Association for the Advancement of Science (AAAS)
2 citations, 0.18%
Annual Reviews
2 citations, 0.18%
IntechOpen
2 citations, 0.18%
Universitas Gadjah Mada
2 citations, 0.18%
Universidade Federal de São Carlos
2 citations, 0.18%
OOO Zhurnal "Mendeleevskie Soobshcheniya"
2 citations, 0.18%
EDP Sciences
1 citation, 0.09%
Begell House
1 citation, 0.09%
The Royal Society
1 citation, 0.09%
Korean Society of Industrial Engineering Chemistry
1 citation, 0.09%
ASM International
1 citation, 0.09%
International Union of Crystallography (IUCr)
1 citation, 0.09%
Japan Society of High Pressure Science and Technology
1 citation, 0.09%
Japan Society of Applied Physics
1 citation, 0.09%
Institute of Chemistry, Technology and Metallurgy
1 citation, 0.09%
Sociedad Espanola de Ceramica y Vidrio
1 citation, 0.09%
American Vacuum Society
1 citation, 0.09%
Institute for Metals Superplasticity Problems of RAS
1 citation, 0.09%
Hindawi Limited
1 citation, 0.09%
National Academy of Sciences of Ukraine (Co. LTD Ukrinformnauka) (Publications)
1 citation, 0.09%
SPIE-Intl Soc Optical Eng
1 citation, 0.09%
OAE Publishing Inc.
1 citation, 0.09%
National University of Science & Technology (MISiS)
1 citation, 0.09%
The Society of Materials Science, Japan
1 citation, 0.09%
Kazan State Power Engineering University
1 citation, 0.09%
Research Square Platform LLC
1 citation, 0.09%
Sakarya University Journal of Science
1 citation, 0.09%
Lectito Publications
1 citation, 0.09%
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400
450
500

Publishing organizations

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2
3
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5
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7
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9
Pennsylvania State University
9 publications, 3.75%
Federal University of Santa Catarina
8 publications, 3.33%
RWTH Aachen University
7 publications, 2.92%
Oak Ridge National Laboratory
6 publications, 2.5%
Sichuan University
4 publications, 1.67%
University of Illinois Urbana-Champaign
4 publications, 1.67%
Hamburg University of Technology
4 publications, 1.67%
Kansas State University
4 publications, 1.67%
University of São Paulo
4 publications, 1.67%
University of Yaoundé I
4 publications, 1.67%
National Institute of Technology Srinagar
3 publications, 1.25%
Northwestern Polytechnical University
3 publications, 1.25%
National Institute for Materials Science
3 publications, 1.25%
Tokyo University of Science
3 publications, 1.25%
Federal University of São Carlos
3 publications, 1.25%
Federal University of Rio Grande do Norte
3 publications, 1.25%
Forschungszentrum Jülich
3 publications, 1.25%
Kyushu University
3 publications, 1.25%
Nagaoka University of Technology
3 publications, 1.25%
Marshall Space Flight Center
3 publications, 1.25%
Bangladesh Council of Scientific and Industrial Research
3 publications, 1.25%
University of Ngaoundéré
3 publications, 1.25%
Université de Limoges
3 publications, 1.25%
Universidade Federal de Campina Grande
3 publications, 1.25%
Sabanci University
2 publications, 0.83%
University of Tabriz
2 publications, 0.83%
Dokuz Eylül University
2 publications, 0.83%
Indian Institute of Technology Guwahati
2 publications, 0.83%
Bhabha Atomic Research Centre
2 publications, 0.83%
Malek-Ashtar University of Technology
2 publications, 0.83%
Tampere University
2 publications, 0.83%
Wuhan University of Science and Technology
2 publications, 0.83%
Eindhoven University of Technology
2 publications, 0.83%
Queen Mary University of London
2 publications, 0.83%
University of Oxford
2 publications, 0.83%
Kingston University
2 publications, 0.83%
National Tsing Hua University
2 publications, 0.83%
Johns Hopkins University
2 publications, 0.83%
Arizona State University
2 publications, 0.83%
Clemson University
2 publications, 0.83%
Nagoya University
2 publications, 0.83%
Kyoto University
2 publications, 0.83%
Osaka University
2 publications, 0.83%
Kwame Nkrumah University of Science and Technology
2 publications, 0.83%
Fraunhofer Institute for Ceramic Technologies and Systems
2 publications, 0.83%
Ulm University
2 publications, 0.83%
Purdue University
2 publications, 0.83%
Freiberg University of Mining and Technology
2 publications, 0.83%
Osaka Metropolitan University
2 publications, 0.83%
Kyoto Institute of Technology
2 publications, 0.83%
Japan Synchrotron Radiation Research Institute
2 publications, 0.83%
Universidade Estadual Paulista
2 publications, 0.83%
Boise State University
2 publications, 0.83%
Sandia National Laboratories
2 publications, 0.83%
Noakhali Science and Technology University
2 publications, 0.83%
Kwame Nkrumah University
2 publications, 0.83%
University of Dschang
2 publications, 0.83%
University of Douala
2 publications, 0.83%
University of New Mexico
2 publications, 0.83%
Idaho National Laboratory
2 publications, 0.83%
University of North Dakota
2 publications, 0.83%
Tarbiat Modares University
1 publication, 0.42%
Indian Institute of Science
1 publication, 0.42%
University of Mohaghegh Ardabili
1 publication, 0.42%
CSIR-National Chemical Laboratory
1 publication, 0.42%
Yildiz Technical University
1 publication, 0.42%
Indian Institute of Technology Kharagpur
1 publication, 0.42%
Indian Institute of Technology Madras
1 publication, 0.42%
Ozyegin University
1 publication, 0.42%
Indian Institute of Technology Mandi
1 publication, 0.42%
Istanbul Gelisim University
1 publication, 0.42%
Khajeh Nasir Toosi University of Technology
1 publication, 0.42%
Islamic Azad University, Tehran
1 publication, 0.42%
Islamic Azad University, Yazd
1 publication, 0.42%
Institute of Space Technology
1 publication, 0.42%
Izmir Katip Celebi University
1 publication, 0.42%
Bayburt University
1 publication, 0.42%
University of Baghdad
1 publication, 0.42%
University of Allahabad
1 publication, 0.42%
Indian Association for the Cultivation of Science
1 publication, 0.42%
Tsinghua University
1 publication, 0.42%
University of Chinese Academy of Sciences
1 publication, 0.42%
Presidency University
1 publication, 0.42%
South China University of Technology
1 publication, 0.42%
Annamalai University
1 publication, 0.42%
Saurashtra University
1 publication, 0.42%
Erzurum Technical University
1 publication, 0.42%
Piri Reis University
1 publication, 0.42%
University of Malaya
1 publication, 0.42%
Nanjing Institute of Technology
1 publication, 0.42%
Beijing University of Technology
1 publication, 0.42%
Lulea University of Technology
1 publication, 0.42%
Wuhan University of Technology
1 publication, 0.42%
Hubei University
1 publication, 0.42%
Swiss Federal Laboratories for Materials Science and Technology
1 publication, 0.42%
UGC-DAE Consortium for Scientific Research
1 publication, 0.42%
University of Oulu
1 publication, 0.42%
Nanyang Technological University
1 publication, 0.42%
Norwegian University of Science and Technology
1 publication, 0.42%
University of Padua
1 publication, 0.42%
1
2
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5
6
7
8
9

Publishing organizations in 5 years

1
2
3
4
5
6
7
Pennsylvania State University
7 publications, 3.3%
RWTH Aachen University
7 publications, 3.3%
Federal University of Santa Catarina
5 publications, 2.36%
Oak Ridge National Laboratory
5 publications, 2.36%
Sichuan University
4 publications, 1.89%
University of Illinois Urbana-Champaign
4 publications, 1.89%
Kansas State University
4 publications, 1.89%
University of Yaoundé I
4 publications, 1.89%
National Institute of Technology Srinagar
3 publications, 1.42%
Tokyo University of Science
3 publications, 1.42%
Hamburg University of Technology
3 publications, 1.42%
Federal University of Rio Grande do Norte
3 publications, 1.42%
Forschungszentrum Jülich
3 publications, 1.42%
Bangladesh Council of Scientific and Industrial Research
3 publications, 1.42%
University of São Paulo
3 publications, 1.42%
University of Ngaoundéré
3 publications, 1.42%
Universidade Federal de Campina Grande
3 publications, 1.42%
Sabanci University
2 publications, 0.94%
University of Tabriz
2 publications, 0.94%
Dokuz Eylül University
2 publications, 0.94%
Bhabha Atomic Research Centre
2 publications, 0.94%
Malek-Ashtar University of Technology
2 publications, 0.94%
National Institute for Materials Science
2 publications, 0.94%
University of Oxford
2 publications, 0.94%
Kingston University
2 publications, 0.94%
Johns Hopkins University
2 publications, 0.94%
Arizona State University
2 publications, 0.94%
Clemson University
2 publications, 0.94%
Federal University of São Carlos
2 publications, 0.94%
Kwame Nkrumah University of Science and Technology
2 publications, 0.94%
Fraunhofer Institute for Ceramic Technologies and Systems
2 publications, 0.94%
Ulm University
2 publications, 0.94%
Freiberg University of Mining and Technology
2 publications, 0.94%
Kyushu University
2 publications, 0.94%
Osaka Metropolitan University
2 publications, 0.94%
Nagaoka University of Technology
2 publications, 0.94%
Japan Synchrotron Radiation Research Institute
2 publications, 0.94%
Universidade Estadual Paulista
2 publications, 0.94%
Sandia National Laboratories
2 publications, 0.94%
Marshall Space Flight Center
2 publications, 0.94%
Noakhali Science and Technology University
2 publications, 0.94%
Kwame Nkrumah University
2 publications, 0.94%
University of Dschang
2 publications, 0.94%
University of Douala
2 publications, 0.94%
University of New Mexico
2 publications, 0.94%
Indian Institute of Science
1 publication, 0.47%
University of Mohaghegh Ardabili
1 publication, 0.47%
CSIR-National Chemical Laboratory
1 publication, 0.47%
Yildiz Technical University
1 publication, 0.47%
Indian Institute of Technology Kharagpur
1 publication, 0.47%
Ozyegin University
1 publication, 0.47%
Indian Institute of Technology Mandi
1 publication, 0.47%
Istanbul Gelisim University
1 publication, 0.47%
Khajeh Nasir Toosi University of Technology
1 publication, 0.47%
Islamic Azad University, Tehran
1 publication, 0.47%
Islamic Azad University, Yazd
1 publication, 0.47%
Izmir Katip Celebi University
1 publication, 0.47%
Bayburt University
1 publication, 0.47%
University of Baghdad
1 publication, 0.47%
University of Allahabad
1 publication, 0.47%
Indian Association for the Cultivation of Science
1 publication, 0.47%
Tsinghua University
1 publication, 0.47%
University of Chinese Academy of Sciences
1 publication, 0.47%
Presidency University
1 publication, 0.47%
Northwestern Polytechnical University
1 publication, 0.47%
Annamalai University
1 publication, 0.47%
Saurashtra University
1 publication, 0.47%
Erzurum Technical University
1 publication, 0.47%
Piri Reis University
1 publication, 0.47%
University of Malaya
1 publication, 0.47%
Tampere University
1 publication, 0.47%
Beijing University of Technology
1 publication, 0.47%
Wuhan University of Science and Technology
1 publication, 0.47%
Hubei University
1 publication, 0.47%
Eindhoven University of Technology
1 publication, 0.47%
UGC-DAE Consortium for Scientific Research
1 publication, 0.47%
University of Oulu
1 publication, 0.47%
Nanyang Technological University
1 publication, 0.47%
Queen Mary University of London
1 publication, 0.47%
Norwegian University of Science and Technology
1 publication, 0.47%
University of Padua
1 publication, 0.47%
Sorbonne University
1 publication, 0.47%
National Dong Hwa University
1 publication, 0.47%
Carnegie Mellon University
1 publication, 0.47%
Hefei University of Technology
1 publication, 0.47%
University of Modena and Reggio Emilia
1 publication, 0.47%
Shanghai Institute of Ceramics, Chinese Academy of Sciences
1 publication, 0.47%
Georgia Institute of technology
1 publication, 0.47%
University of South Australia
1 publication, 0.47%
Australian Nuclear Science & Technology Organisation
1 publication, 0.47%
University of Cape Town
1 publication, 0.47%
University of the Witwatersrand
1 publication, 0.47%
Council for Scientific and Industrial Research
1 publication, 0.47%
National Institute of Standards and Technology
1 publication, 0.47%
Rutgers, The State University of New Jersey
1 publication, 0.47%
Ohio State University
1 publication, 0.47%
Technical University of Berlin
1 publication, 0.47%
Kyoto University
1 publication, 0.47%
Osaka University
1 publication, 0.47%
Tohoku University
1 publication, 0.47%
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2
3
4
5
6
7

Publishing countries

10
20
30
40
50
60
70
USA, 67, 27.92%
USA
67 publications, 27.92%
China, 31, 12.92%
China
31 publications, 12.92%
Germany, 28, 11.67%
Germany
28 publications, 11.67%
Japan, 26, 10.83%
Japan
26 publications, 10.83%
Brazil, 23, 9.58%
Brazil
23 publications, 9.58%
India, 16, 6.67%
India
16 publications, 6.67%
Cameroon, 6, 2.5%
Cameroon
6 publications, 2.5%
United Kingdom, 5, 2.08%
United Kingdom
5 publications, 2.08%
Iran, 5, 2.08%
Iran
5 publications, 2.08%
Turkey, 5, 2.08%
Turkey
5 publications, 2.08%
France, 4, 1.67%
France
4 publications, 1.67%
Bangladesh, 4, 1.67%
Bangladesh
4 publications, 1.67%
Italy, 4, 1.67%
Italy
4 publications, 1.67%
Canada, 4, 1.67%
Canada
4 publications, 1.67%
Ghana, 3, 1.25%
Ghana
3 publications, 1.25%
Finland, 3, 1.25%
Finland
3 publications, 1.25%
Australia, 2, 0.83%
Australia
2 publications, 0.83%
Nigeria, 2, 0.83%
Nigeria
2 publications, 0.83%
Netherlands, 2, 0.83%
Netherlands
2 publications, 0.83%
Norway, 2, 0.83%
Norway
2 publications, 0.83%
Ukraine, 1, 0.42%
Ukraine
1 publication, 0.42%
Belgium, 1, 0.42%
Belgium
1 publication, 0.42%
Greece, 1, 0.42%
Greece
1 publication, 0.42%
Egypt, 1, 0.42%
Egypt
1 publication, 0.42%
Mexico, 1, 0.42%
Mexico
1 publication, 0.42%
Pakistan, 1, 0.42%
Pakistan
1 publication, 0.42%
Singapore, 1, 0.42%
Singapore
1 publication, 0.42%
Syria, 1, 0.42%
Syria
1 publication, 0.42%
Togo, 1, 0.42%
Togo
1 publication, 0.42%
Switzerland, 1, 0.42%
Switzerland
1 publication, 0.42%
Sweden, 1, 0.42%
Sweden
1 publication, 0.42%
Ethiopia, 1, 0.42%
Ethiopia
1 publication, 0.42%
South Africa, 1, 0.42%
South Africa
1 publication, 0.42%
10
20
30
40
50
60
70

Publishing countries in 5 years

10
20
30
40
50
USA, 50, 23.58%
USA
50 publications, 23.58%
Germany, 25, 11.79%
Germany
25 publications, 11.79%
Brazil, 18, 8.49%
Brazil
18 publications, 8.49%
China, 17, 8.02%
China
17 publications, 8.02%
Japan, 16, 7.55%
Japan
16 publications, 7.55%
India, 12, 5.66%
India
12 publications, 5.66%
Cameroon, 6, 2.83%
Cameroon
6 publications, 2.83%
Turkey, 5, 2.36%
Turkey
5 publications, 2.36%
Bangladesh, 4, 1.89%
Bangladesh
4 publications, 1.89%
United Kingdom, 4, 1.89%
United Kingdom
4 publications, 1.89%
Iran, 4, 1.89%
Iran
4 publications, 1.89%
Ghana, 3, 1.42%
Ghana
3 publications, 1.42%
Italy, 3, 1.42%
Italy
3 publications, 1.42%
France, 2, 0.94%
France
2 publications, 0.94%
Australia, 2, 0.94%
Australia
2 publications, 0.94%
Canada, 2, 0.94%
Canada
2 publications, 0.94%
Norway, 2, 0.94%
Norway
2 publications, 0.94%
Finland, 2, 0.94%
Finland
2 publications, 0.94%
Ukraine, 1, 0.47%
Ukraine
1 publication, 0.47%
Belgium, 1, 0.47%
Belgium
1 publication, 0.47%
Egypt, 1, 0.47%
Egypt
1 publication, 0.47%
Mexico, 1, 0.47%
Mexico
1 publication, 0.47%
Netherlands, 1, 0.47%
Netherlands
1 publication, 0.47%
Singapore, 1, 0.47%
Singapore
1 publication, 0.47%
Syria, 1, 0.47%
Syria
1 publication, 0.47%
Ethiopia, 1, 0.47%
Ethiopia
1 publication, 0.47%
South Africa, 1, 0.47%
South Africa
1 publication, 0.47%
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20
30
40
50