Country | Documents | Citable documents | Citations | Self-Citations | Citations per Document | H index | ||
---|---|---|---|---|---|---|---|---|
1 | United States | 9013 | 8923 | 456188 | 149898 | 50.61 | 1138 | |
2 | Japan | 5281 | 5256 | 150198 | 42791 | 28.44 | 571 | |
3 | Germany | 3840 | 3831 | 137668 | 32979 | 35.85 | 670 | |
4 | China | 3139 | 3136 | 31744 | 13399 | 10.11 | 792 |
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