3 IZA Discussion Papers
IZA Discussion Paper No. 14201
published in: Health Economics, 2022, 31 (6), 1228-1248
IZA Discussion Paper No. 6505
revised version published in: Applied Economics, 2014, 46 (17), 2066-2086
IZA Discussion Paper No. 4016
revised version published in: Public Choice,2012, 151 (3-4), 465 - 495