共 3 条
[2]
Innovation, Imitation and Intellectual Property Rights: A Note on Helpman's Model[J] . Debasis Mondal,Manash Ranjan Gupta. . 2006 (1)
[3]
Technological Diffusion, Convergence, and Growth[J] . Robert J. Barro,Xavier Sala-i-Martin.Journal of Economic Growth . 1997 (1)