3 IZA Discussion Papers
IZA Discussion Paper No. 6573
published in: Journal of Health Economics, 2014, 33, 94-112.
IZA Discussion Paper No. 4512
published in: Monthly Labor Review, 2010, 133 (11), 16-36
IZA Discussion Paper No. 1780
published in: Journal of Labor Research, 2008, 29 (2), 114-137