2 IZA Discussion Papers
IZA Discussion Paper No. 6064
published in: Empirical Economics, 2015, 48, 849 - 881
IZA Discussion Paper No. 2846
published as 'Estimating the Effects of Length of Exposure to Instruction in a Training Program: The Case of Job Corps ' in: Review of Economics and Statistics, 2012, 94 (1), 153–171