1
文献名： "Technology, International Trade, and Pollution from US Manufacturing."
作者：Levinson, Arik 2009.
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：. "How Do Gasoline Prices Affect Fleet Fuel Economy?"
作者：Li, Shanjun, Christopher Timmins, and Roger H. von Haefen. 2009
期刊：American Economic Journal: Economic Policy, 1(2): 113–37.
电子链接: http://www.aeaweb.org/articles.php?doi=10.1257/pol.1.2.113