4Poon. T. Beyond the global production networks:A case of further upgrading of Taiwan's information technology industry [J]. Technology and Globalisation,2004, 1 : 130-145.
5Chamberlain,G.Comment:Sequential moment restrictions in panel data [J]. Journal of Business and Economic Statistics, 1992,10:20-26.
6Wooldridge J.Multiplicative panel data models without the strict exogeneity assumption [J]. Econometric Theory, 1997,13 : 667-678.
7Blundell R,and Bond S. Initial conditions and moment restrictions in dynamic panel data models [J]. Journal of Econometrics, 1998,87 : 115-149.
