[1] MANSFIELD E. Managerial Economics: Theory, Applications, and Cased[M].New York: W.W. Norton & Company, Inc,1996: 35-37.[2] NEGASSI S. R&D co-operation and innovation a microeconometric study on French firms[J]. Research Policy, 2004, 33(3):365 (共 1989 字) [阅读本文] >>