2 IZA Discussion Papers
IZA Discussion Paper No. 11293
published in: International Journal of Manpower, 2018, 39 (4), 631-636
IZA Discussion Paper No. 3956
published in: William Breit and Barry T. Hirsch (eds.), Lives of the Laureates: Twenty-three Nobel Economists, 5th ed., Cambridge: MIT Press, 2009