43 IZA Discussion Papers
IZA Discussion Paper No. 533
published in: Torben Andersen and Per Molander (eds,): Alternatives for Welfare Policy: Coping with Internationalisation and Demographic Change, Cambridge, 2003, 255 - 275
IZA Discussion Paper No. 456
published in: Scandinavian Journal of Economics, 2002, 104 (3), 343-364
IZA Discussion Paper No. 11
published in: Applied Economics, 2002, 34 (7), 865-876