Country | Documents | Citable documents | Citations | Self-Citations | Citations per Document | H index | ||
---|---|---|---|---|---|---|---|---|
1 | United States | 27560 | 27395 | 914782 | 296889 | 33.19 | 1404 | |
2 | Japan | 5918 | 5890 | 67972 | 15616 | 11.49 | 400 | |
3 | Germany | 5423 | 5387 | 129462 | 21572 | 23.87 | 640 | |
4 | United Kingdom | 5177 | 5102 | 123749 | 23206 | 23.90 | 700 |
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