Rank

Country/Territory

Papers

Citations

Citations

Per Paper

1

USA

79,259

393,776

4.97

2

CHINA MAINLAND

56,887

200,756

3.53

3

FRANCE

27,360

116,381

4.25

4

GERMANY（FED REP GER）

22,079

91,816

4.16

5

ITALY

17,308

69,745

4.03

6

ENGLAND

14,952

69,059

4.62

7

CANADA

14,599

61,625

4.22

8

SPAIN

14,542

56,912

3.91

9

JAPAN

14,933

45,658

3.06

10

AUSTRALIA

6,643

28,330

4.26

11

SOUTH KOREA

8,351

27,027

3.24

12

RUSSIA

14,722

25,724

1.75

13

POLAND

8,008

22,560

2.82

14

IRAN

6,305

21,601

3.43

15

INDIA

7,816

21,586

2.76

16

ISRAEL

5,450

20,865

3.83

17

BRAZIL

6,266

20,270

3.23

18

TAIWAN

5,673

20,260

3.57

19

TURKEY

6,194

19,579

3.16

20

SWITZERLAND

3,779

18,873

4.99