1. Aakvik, A., Heckman, J., Vytlacil, E., 1999. Training effects on employment when the training effects are heterogeneous: an application to Norwegian vocational rehabilitation programs, working paper, University of Chicago.
2. Semiparametric estimation of censored selection models with a nonparametric selection mechanism;Ahn;Journal of Econometrics,1993
3. Angrist, J., Graddy, K., Imbens, G., 1995. Non-parametric demand analysis with an application to the demand for fish, working paper, Massachusetts Institute of Technology.
4. Asymptotic efficiency in semi-parametric models with censoring;Chamberlain;Journal of Econometrics,1986
5. Das, M., Newey, W., 1998. Non-parametric estimation of the sample selection model, working paper, Massachusetts Institute of Technology.