3 IZA Discussion Papers
IZA Discussion Paper No. 3718
published in: Small Business Economics, 2009, 33 (4), 375-395
IZA Discussion Paper No. 1296
published in: Industrial and Labor Relations Review, 2007, 60 (2), 225-245
IZA Discussion Paper No. 1292
published in: Journal of Labor Economics, 2007, 25 (2), 289-323