4National Science Foundation Office of Inspector General,2003,Semiannual Report to the Congress, http://www. nsf. gov/publications/pub_summ. jsp? ods key = oigmarch2003. 被引量：1
5National Science Foundation Office of Inspector General ,2004,Semiannual Report to the Congress, http ://www. nsf. gov/publications/pub_summ. jsp? ods_key = oigsept2004. 被引量：1
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