Estimating Distributions of Treatment Effects with an Application to the Returns to Schooling and Measurement of the Effects of Uncertainty on College Choice
Pedro Carneiro, Karsten Hansen, James Heckman
International Economic Review, vol. 44, 2003, p. 361-422.

The Evidence on Credit Constraints in Post-secondary Schooling
Pedro Carneiro, James Heckman
Economic Journal, vol. 112, 2002, p. 705-734.