4 IZA Discussion Papers
IZA Discussion Paper No. 10554
IZA Discussion Paper No. 10230
published in Journal of Asia Pacific Economy, 2017, 22 (3), 525-546
IZA Discussion Paper No. 9018
published in: Eurasian Geography and Economics, 2015, 56 (1), 44-69
IZA Discussion Paper No. 5367
published as 'The Awarding of PhDs in the United States and Canada: War, the Draft, and Other Economic Determinants' in: Applied Economics, 2015, 47 (28), 2939 - 2958