44 IZA Discussion Papers
IZA Discussion Paper No. 1221
revised version published in: A. Heshmati (Ed), Global Trends in Income Inequality, Hauppauge, NY: Nova Science Publishers, 2007, 27-48
IZA Discussion Paper No. 1049
published in: Sociological Methods and Research, 2006, 34 (4), 427-468
IZA Discussion Paper No. 253
IZA Discussion Paper No. 252