Table 2 Top universities and countries by a-index

Harvard University

31

United States

54

Princeton University

30

Germany

45

University of California, Berkeley

29

United Kingdom

33

Massachusetts Institute of Technology

28

Russia

31

Stanford University

28

Netherlands

29

The University of Chicago

25

France

26

Lomonosov Moscow State University

25

Switzerland

25

University of Cambridge

24

Austria

22

Columbia University

24

Canada

21

ETH Zürich

24

Belgium

19

Georg-August-Universität Göttingen

22

India

19

University of Wisconsin-Madison

22

Sweden

18

California Institute of Technology

22

Ukraine

17

University of Michigan

21

Australia

17

University of Oxford

21

Romania

17

Universiteit van Amsterdam

21

Poland

17

Yale University

20

Spain

17

University of Illinois at Urbana-Champaign

20

Israel

17

Universität Berlin

20

Japan

16

Ludwig-Maximilians-Universität München

20

Italy

15

Carnegie Mellon University

20

Finland

15