@unpublished{publication-7254, author={Biewen, Martin and Fitzenberger, Bernd and Osikominu, Aderonke and Paul, Marie}, institution={University of Zurich}, issn={1664-7041}, number=91, pages=78, series={Working paper series / Department of Economics}, title={The effectiveness of public sponsored training revisited: the importance of data and methodological choices}, year=2012, }