IZA Publications
IZA Discussion Paper No. 4304
published in: Econometric Journal, 2009, 12 (Supplement), S230-S234
IZA Discussion Paper No. 1700
published in: E. Hanushek and F. Welch, eds., Handbook of the Economics of Education, North Holland: Amsterdam, 2006, 307-458
IZA Discussion Paper No. 775
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