3 IZA Discussion Papers
IZA Discussion Paper No. 9477
published in: Oxford Development Studies, 2016, 44 (1), 1-27
IZA Discussion Paper No. 6728
published in: Region et Developpement, 2012, 35, 151-176
IZA Discussion Paper No. 3422
published in: Sergio Destefanis and Marco Musella (eds.), Paid and Unpaid Labour in Social Utility Services, Heidelberg: Physica Verlag, 2009