2 IZA Discussion Papers
IZA Discussion Paper No. 3294
published in: Journal of Labor Market Research/Zeitschrift für ArbeitsmarktForschung, 2007, 40 (4), 361-381
IZA Discussion Paper No. 1264
published as 'Unions, Training, and Firm Performance' in: Journal of Labor Market Research/Zeitschrift für ArbeitsmarktForschung, 2007, 40 (4), 361-381