3Acemoglu,Daron, and David Autor, 2010, “Skills,Tasks and Technologies: Implications for Employment and Earnings”,WorkingPaper.
4Autor, D. H. , L. F. Katz, and M. S. Kearney, 2008,“Trends in U.S. Wage Inequality: Re-Assessing the Revisionists”,Reviewof Economics and Statistics, 90(2) : 300—323.
5Bamow, B. , G. Cain, and A. Goldberger, 1981, M Issues in the Analysis of Selectivity BiasM t Evaluation Studies Review Annual 5 ,Sage Publications.
6Brown, G. K.,and T. Mergoupis, 2011 , u Treatment Interaction with Non-Experimentai Data in Stata”,Stata Journal,11(4):545—555.
7Bryson, A. , 2002, “The Union Membership Wage Premium: An Analysis Using Propensity Score Matching” , Working paper.
8Card, D. , 1996, “The Effect of Unions on the Structure of Wages: A Longitudinal Analysis”,Econometrica, 64(4) : 957—979.
9Card,D.,T. Lemieux,and W. C. Riddell, 2004, “Union and Wage Inequality”, Journal of Labor Research, 25(4) : 519—559.
10Chen, F.,2003,“ Between the State and Labor: The Conflict of Chinese Trade Unions,Double Identity in Market Reform”,ChinaQuarterly, 176( Dec. ) : 1006—1028.