63 IZA Discussion Papers
IZA Discussion Paper No. 1336
published as 'Educational standards in private and public schools' in: The Economic Journal, 2008, 118 (533), 1866-1887
IZA Discussion Paper No. 1173
published in: Labour Economics, 2008, 15 (1), 118-140
IZA Discussion Paper No. 705
published in: Economics of Education Review, 2005, 24 (5), 563-577