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James Heckman, Hidehiko Ichimura, Jeffrey Smith and Petra Todd, January 1998,  Characterization of selection bias using experimental data Econometrica,  Vol. 66, pp. 1017-1098, Journal Articles
James Heckman, Hidehiko Ichimura and Petra Todd, January 1998,  Matching as an econometric estimator Review of Economic Studies,  Vol. 65, pp. 261-294, Journal Articles
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