Country | Documents | Citable documents | Citations | Self-Citations | Citations per Document | H index | ||
---|---|---|---|---|---|---|---|---|
1 | United States | 52507 | 50284 | 4679365 | 1431191 | 89.12 | 602 | |
2 | Japan | 14326 | 13749 | 1011571 | 252781 | 70.61 | 337 | |
3 | Germany | 12127 | 11896 | 751447 | 155049 | 61.96 | 300 | |
4 | China | 37337 | 37264 | 1769841 | 1112413 | 47.40 | 425 |
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