4 IZA Discussion Papers
IZA Discussion Paper No. 8779
IZA Discussion Paper No. 7127
IZA Discussion Paper No. 990
published in: E. Berenguer (ed.), Generational Accounting in Spain, Madrid: IFS, 2005, 27-66
IZA Discussion Paper No. 41
published in: Swedish Economic Policy Review, 1998, 5(2), 303-343