5 IZA Discussion Papers
IZA Discussion Paper No. 15507
IZA Discussion Paper No. 10731
published in: Journal of the Economics of Ageing, 2018, 12, 225 -235
IZA Discussion Paper No. 10592
IZA Discussion Paper No. 6249
IZA Discussion Paper No. 1836
published in: Journal of Population Economics, 2010, 23 (3), 1047-1071