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2. Two-Stage Least Squares Estimation of Average Causal Effects in Models with Variable Treatment Intensity;Joshua D Angrist;Journal of the American Statistical Association,1995
3. Brain Drain and Human Capital Formation in Developing Countries : Winners and Losers;Michel Beine;Journal of Development Economics,2001
4. How Much Should We Trust Differences-in-Differences Estimates?;Marianne Bertrand;Quarterly Journal of Economics,2004