1. Alber, J., Köhler, U., 2004. Health and Care in an Enlarged Europe. European Foundation for the Improvement of Living and Working Conditions, Dublin.
2. The economic reality of the beauty myth;Averett;Journal of Human Resources,1996
3. Instrumental variables and GMM: estimation and testing;Baum;The Stata Journal,2003
4. Slimming behaviour in Denmark assessed by telephone interviews in 1992 and 1998;Bay-Hansen;Ugeskr. læger,2001