7 IZA Discussion Papers
IZA Discussion Paper No. 16980
IZA Discussion Paper No. 16979
IZA Discussion Paper No. 14527
IZA Discussion Paper No. 12575
IZA Discussion Paper No. 11976
IZA Discussion Paper No. 6780
published in: Scientometrics, 2013, 95 (3), 1095-1112
IZA Discussion Paper No. 3271
published in: Scientometrics, 2009, 80 (1), 233-254