256 IZA Discussion Papers
IZA Discussion Paper No. 219
published in: Journal of Public Economics, 2001, 82 (1), 115-146
IZA Discussion Paper No. 203
IZA Discussion Paper No. 152
published in: Schweizerische Zeitschrift für Nationalökonomie und Statistik / Swiss Journal of Economics and Statistics, 136 (2000), 1-33
IZA Discussion Paper No. 95
IZA Discussion Paper No. 73
IZA Discussion Paper No. 29