请帮忙找一篇文章。
Title: Factor Substitution and Factor-Augmenting Technical Progress in the United States: A Normalized Supply-Side System Approach
Author: Klump, R.; McAdam, P.; Willman, A.
Source: Review of Economics and Statistics, 2007, 89(1): 183

下载地址
http://www.mitpressjournals.org/doi/abs/10.1162/rest.89.1.183


注意不是该文的working paper。非常感谢！