164 IZA Discussion Papers
IZA Discussion Paper No. 542
published in: Journal of Economic Surveys, 2004, 18 (2), 181-224
IZA Discussion Paper No. 261
published in: Scandinavian Journal of Economics, 2005, 107 (2), 375-394
IZA Discussion Paper No. 236
published in: Becker, I., Ott, N. and Rolf, G. (eds.), Soziale Sicherung in einer dynamischen Gesellschaft, Campus-Verlag, Frankfurt, 583-617, 2001
IZA Discussion Paper No. 30
published in: Journal of Comparative Economics, 1999, 27 (1), 61-89