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Citation of US and non-US Publications
| Cited publication is US publication | Cited publication is Non-US publication | Total | |
| Citing publication has US author | 260 | 84 | 344 |
| Citing publication has no US author | 245 | 146 | 391 |
| Total | 505 | 230 | 735 |
df = 1, Chi-Square = 14.21 p < 0.001
