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1. University of California, Berkeley  (71)
2. Stanford University  (71)
3. University of Illinois at Urbana-Champaign  (37)
4. Carnegie Mellon University  (36)
5. Georgia Institute of Technology  (34)
6. University of Alberta (Canada)  (32)
7. SpringerLink (Online service)  (32)
8. University of Michigan  (31)
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11. The Johns Hopkins University  (24)
12. University of Florida  (23)
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14. University of California, Davis  (21)
15. University of Puerto Rico, Mayaguez (Puerto Rico)  (21)
16. Michigan State University  (21)
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18. The University of Wisconsin - Madison  (20)
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1. 之前1999  (49)
2. 1999到2003  (327)
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