Country | Documents | Citable documents | Citations | Self-Citations | Citations per Document | H index | ||
---|---|---|---|---|---|---|---|---|
1 | United States | 19930 | 19404 | 1491182 | 620228 | 74.82 | 994 | |
2 | Japan | 6925 | 6857 | 375041 | 84650 | 54.16 | 490 |
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