163 IZA Discussion Papers
IZA Discussion Paper No. 485
published in: European Economic Review, 2006, 50 (3), 695-736
IZA Discussion Paper No. 284
published in: Journal of Economic Behavior and Organization, 2003, 52 (1), 27-45
IZA Discussion Paper No. 261
published in: Scandinavian Journal of Economics, 2005, 107 (2), 375-394
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