可以看看如下文章：
Heckman, J. Sample Selection Bias as a Specification Error. Econometrica, 1979, 47 (1): 153-161.
Vella, F. Estimating models with sample selection bias: a survey. Journal of Human Resources, 1998, 33 (1): 127-169.
Puhani, P. The Heckman correction for sample selection and its critique. Journal of Economic Surveys, 2000, 14 (1): 53-68.
Lian, Y., Su, Z., Gu, Y. Evaluating the effects of equity incentives using PSM: Evidence from China. Frontiers of Business Research in China, 2011, 5 (2): 266-290. (连玉君)

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