4Parente, S.L. & E. C. Prescott( 1994), "Barriers to technology adoption and development", Journal of Political Economy 102: 298 - 321.
5Galor, O. (1996), " Convergence? Inferences from theoretical models", The Economic Journal 106:1056 -1069.
6Basu, S. & D. N. Weil( 1998 ), "Appropriate technology and growth", The Quarterly Journal of Eeonomies 113 : 1025 - 54.
7Atkinson, A.B. & J. E. Stiglitz ( 1969), "A new view of technological change", Economic Journal 79:573 - 578.
8Acemoglu, D. & F. Zilibotti (2001), " Productivity differences", Quarterly Journal of Economics 116 : 563 - 606.
9Acemoglu, D. , P. Aghion & F. Zilibotti (2006), Distance to frontier, selection, and economic growth”, Journal of the European Economic Association 4 ( 1 ) :37 - 74.
10Caselli, F. & W. J. Coleman ( 2006 ), "The world technology frontier", The American Economic Review 96 (3) :499 - 522.