83 IZA Discussion Papers
IZA Discussion Paper No. 359
published in: Regional Science and Urban Economics 2004, 34 (5), 565-573
IZA Discussion Paper No. 279
published in: Labour Economics, 2005, 12 (3), 379-406
IZA Discussion Paper No. 273
published in: Economic Journal, 2006, 116 (511), 382-407