8Gassmann O, Enkel E, Chesbrough H. The future of open innovation[J]. R&D Management, 2010,40(3): 213-221.
9Srivastava M K, Gnyawali D R. When do relational re- sources matter? Leveraging portfolio technological re- sources for breakthrough innovation[J]. Academy of Management Journal, 2011,54(4):797-810.
10Faems D, De Visser M, Andries P, et al. Technology alliance portfolios and financial performance: Value-en- hancing and cost-increasing effects of open innova- tion[J]. Journal of Product Innovation Management, 2010,27(6) :785-796.