3 IZA Discussion Papers
IZA Discussion Paper No. 16690
IZA Discussion Paper No. 11421
substantially revised version forthcoming as 'The Determinants of University Dropout: A Review of the Socio-Economic Literature' in: Socio-Economic Planning Sciences.
IZA Discussion Paper No. 2787
revised version published in: Education Economics, 2010, 18(1), 111-123