2010年12月
IZA DP No. 5367: The Production of PhDs in the United States and Canada
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
2010年12月
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