6NIETO M, QUEVEDO P. Absorptive Capacity, Technological Opportunity, Knowledge Spillovers, and Innovative Effort [J]. Technovation, 2005, 25 (10): 1141 - 1157.
7AITKEN B J, HARRISON A E. Do Domestic Firms Benefit from Direct Foreign Investment? Evidence from Venezuela[J] . The American Economic Review, 1999, 89, (3): 605-618.
8BLOMSTROM M, KOKKO A. Multinational Corporations and Spillovers[J]. Journal of Economic Surveys, 1998, 12, (3): 247 - 277.
9GRILICHES Z. Issues in Assessing the Contribution of Research and Development to Productivity Growth[J]. Bell Journal of Economics, 1979, 10 (1): 92 - 116.
10JAFFE A B. Real Effects of Academic Research[J]. The American Economic Review, 1989, 79 (5): 957 -970.