3 IZA Discussion Papers
IZA Discussion Paper No. 1888
published in: Industrial and Labor Relations Review, 2011, 64(2), 341-355
IZA Discussion Paper No. 1622
published in: Economica, 2006, 73 (291), 533-545
IZA Discussion Paper No. 660
revised version published as "A Comparative Study of the Employer Size Wage Effect in Africa" in: Journal of Economic Development, 2004, 29 (1), 137-161