求英文文献2篇

Roberts ， M. and T. Whited. 2011.endogenety in empirical corporate finance ， Working paper,
University Of Pennsylvania and University Of Rochester.
Morgan, S., and D. Harding. 2006. Matching estimators of causal effects: Prospects and pitfalls in theory
and practice. Sociological Methods and Research 35 (1): 3—60.

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