903 IZA Discussion Papers
IZA Discussion Paper No. 9
IZA Discussion Paper No. 8
published in: Staatswissenschaften und Staatspraxis, 1998, 9 (2), 191-208
IZA Discussion Paper No. 4
published in: Ohashi, Isao/ Tachibanaki, Toshiaki (eds.), International Labour Markets, Incentives and Employment, Macmillan Press LTD, Houndsmills, 1998, 300-332