2Tsai W. Knowledge transfer in intraorganizational networks: Effects of network position and absorptive capacity on business unit innovation and performance [J]. Academy of management journal. 2001,44(5) :996 -1004.
3Exposito-Langa M, Molina- Morales F X, Capo- Vicedo J. New product development and absorptive ca pacity in industrial districts:a multidimensional approach [J]. Regional Studies, 2011,45 (3) : 319 - 331.
4Cassiman B, Veugelers R. R&D cooperation and spillo vers: some empirical evidence from Belgium[J]. The A merican Economic Review,2002,92(4) :1169-1184.
5Czarnitzki D, Licht G. Additionality of public R&D grants in a transition economy[J]. Economics of Transition, 2006,14(1) :101-131.
