3 IZA Discussion Papers
IZA Discussion Paper No. 12143
revised version published in: Economics, 2019, 13 (1), 20190050
IZA Discussion Paper No. 12142
revised version published in: Plos One, 2020, 15 (2), e0227758
IZA Discussion Paper No. 8950
published in: NIESR Review: Special Issue of Sports Economics , 2015, 232 (1), R30 - R40