43 IZA Discussion Papers
IZA Discussion Paper No. 3370
IZA Discussion Paper No. 2095
published in: Economic Journal, 2007, 117 (523), 1193-1215
IZA Discussion Paper No. 1198
revised version published as' Complementarity and Custom in Wage Contract Violation' in: Review of Economicss and Statistics, 2009, 91(4), 832 - 849