Country | Documents | Citable documents | Citations | Self-Citations | Citations per Document | H index | ||
---|---|---|---|---|---|---|---|---|
1 | United States | 18897 | 17937 | 1388267 | 582371 | 73.46 | 994 | |
2 | Japan | 6944 | 6728 | 340760 | 80829 | 49.07 | 490 |
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