Country | Documents | Citable documents | Citations | Self-Citations | Citations per Document | H index | ||
---|---|---|---|---|---|---|---|---|
1 | United States | 21272 | 20026 | 1353088 | 511848 | 63.61 | 994 | |
2 | China | 9448 | 9395 | 369990 | 174892 | 39.16 | 511 | |
3 | Japan | 6342 | 6196 | 253523 | 56380 | 39.98 | 490 | |
4 | Germany | 5373 | 5162 | 314829 | 64794 | 58.59 | 557 |
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