1. Aakvik, A., J.J. Heckman, and E.J. Vytlacil. 2005. Estimating treatment effects for discrete outcomes when responses to treatment vary: An application to Norwegian vocational rehabilitation programs. Journal of Econometrics 125: 15–51.
2. Arcidiacono, P., H. Sieg, and F. Sloan. 2007. Living rationally under the volcano? An empirical analysis of heavy drinking and smoking. International Economic Review 48: 37–65.
3. Auld, M.C. 2006. Using observational data to identify the causal effects of health-related behaviour. In The Elgar companion to health economics, ed. A.M. Jones. Cheltenham: Edward Elgar.
4. Auster, R., I. Leveson, and D. Sarachek. 1969. The production of health an exploratory study. Journal of Human Resources 15: 411–436.
5. Bago d’Uva, T. 2006. Latent class models for utilisation of health care. Health Economics 15: 329–343.