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2. Verlust von Humankapital in Regionen mit hoher Arbeitslosigkeit [Loss of human capital in regions of high unemployment];Ebenrett;Aus Politik und Zeitgeschichte B6–,2003
3. Economic gains from educational reform by US states;Hanushek;J. Hum. Cap.,2017
4. IQ and the wealth of states;Kanazawa;Intelligence,2006
5. Estimating state IQ: measurement challenges and preliminary correlates;McDaniel;Intelligence,2006