5 IZA Policy Papers
IZA Policy Paper No. 131
Published in Portuguese Economic Journal, 2017, Volume 16, Nº 3.
IZA Policy Paper No. 120
IZA Policy Paper No. 87
IZA Policy Paper No. 47
IZA Policy Paper No. 39
published in: CESifo Forum, 2012, 13 (1), 3-9