24 IZA Discussion Papers
IZA Discussion Paper No. 2598
published in: Statistica Neerlandica, 2007, 61(3), 305-328
IZA Discussion Paper No. 1263
revised version published in: A. Heshmati (ed.), Global Trends in Income Inequality, Hauppauge, New York: Nova Science Publishers, 2007
IZA Discussion Paper No. 253
IZA Discussion Paper No. 252
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