44 IZA Discussion Papers
IZA Discussion Paper No. 4632
IZA Discussion Paper No. 4572
published in: Economics of Education Review, 2010, 29 (5), 783-794
IZA Discussion Paper No. 2728
published in: Journal of Urban Economics, 2008, 63 (1), 631-650
IZA Discussion Paper No. 1391
published in: Schriften des Vereins für Socialpolitik, 2006, 313, 39-54.