Country | Documents | Citable documents | Citations | Self-Citations | Citations per Document | H index | ||
---|---|---|---|---|---|---|---|---|
1 | United States | 20854 | 20120 | 1320047 | 519504 | 63.30 | 994 | |
2 | China | 6913 | 6882 | 259419 | 115010 | 37.53 | 511 | |
3 | Japan | 6700 | 6632 | 289042 | 67218 | 43.14 | 490 | |
4 | Germany | 5014 | 4872 | 332732 | 64217 | 66.36 | 557 |
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