2 IZA Discussion Papers
IZA Discussion Paper No. 5091
published in: Journal of Population Economics, 2013, 26 (4), 1585-1608
IZA Discussion Paper No. 1358
published as 'The determinants of secondary jobholding in Germany and the UK' in: Zeitschrift für ArbeitsmarktForschung / Journal for Labour Market Research, 2009, 42 (2), 107-120