@techreport{Pfeiffer2012Causa-36998,
  year={2012},
  series={IZA Discussion Paper},
  title={Causal Returns to Schooling and Individual Heterogeneity},
  number={6588},
  url={http://ftp.iza.org/dp6588.pdf},
  author={Pfeiffer, Friedhelm and Pohlmeier, Winfried}
}

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