4Hason G H,Mataloni R J,Slaughter M J. Vertical Production Networks in Multinational Firms[EB/OL]. [2009-03-06]. http,,//www, nber. org/papers/w9723.
5M. Ferrantino,R. Koopman,Zhi Wang,et al. Classification and Statistical Reconciliation of Trade in AdvancedTechnology Products:The Case of China and the United States[EB/OL]. [2009-08-08] . http://www, crpe. cn/06c rpe/index/clinic/lunwen/20071108b, pdf.
6Freeman,C. Technological Infrastructure and Inter- national Competitiveness[J].International & Corporate Change. 2004(3) :541 - 569.