2.964 IZA Discussion Papers
IZA Discussion Paper No. 16
IZA Discussion Paper No. 9
IZA Discussion Paper No. 8
published in: Staatswissenschaften und Staatspraxis, 1998, 9 (2), 191-208
IZA Discussion Paper No. 5
published in: Labour Economics, 1999, 6 (2), 229-251