6Evenson R and Westphal L, 1995, "Technological Change and Technological Strategy", In Behrman and Sfinivasan eds, Handbook of Development, vol (3), Elsevier, Armsterdam.
7Grossman, G. and E. Helpman, 1991, Innovation and Growth in the World Economy, MIT Press, Cambridge.
8Heckman J. , 2003, "China's Investment in Human Capital, Economic Development and Cultural Change", 795-804.
9Keller W. ,2001, "International Technology Diffusion", NBER Working Paper No,8573.
10Romer P. M. , 1990, "Endogenous Technological Change", Journal of Political Economy, 98, 71-102.
