1
文献名：Technology, International Trade, and Pollution from US Manufacturing
作者： Arik Levinson
期刊：American Economic Review, 99(5): 2177–92.
电子链接: http://www.aeaweb.org/articles.php?doi=10.1257/aer.99.5.2177

2
文献名： "Innovation Diffusion in Heterogeneous Populations: Contagion, Social Influence, and Social Learning."
作者： Young, H. Peyton 2009.
期刊：American Economic Review, 99(5): 1899–1924.
电子链接: http://www.aeaweb.org/articles.php?doi=10.1257/aer.99.5.1899