56 IZA Discussion Papers
IZA Discussion Paper No. 1309
published in: European Economic Review, 2005, 49 (1), 9-27
IZA Discussion Paper No. 859
published in: European Economic Review, 2005, 49 (1), 75-98 and in: D. Hamermesh and G. Pfann (eds.). The Economics of Time Use, Elsevier, 2005
IZA Discussion Paper No. 796
IZA Discussion Paper No. 621
published in: Journal of Theoretical Biology, 2007, 247, 397- 412,
IZA Discussion Paper No. 407
published in: IAW-Report / Institut für Angewandte Wirtschaftsforschung, 2003, 1, 7 - 66
IZA Discussion Paper No. 157
published in: Labour Economics, 2001, 8 (6), 621-648
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