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@article{econhot_econhot-reading-08,
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@article{econhot_econhot-reading-13,
  title = {On the Role of the Propensity Score in Efficient Semiparametric Estimation of Average Treatment Effects},
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  journal = {Econometrica},
  year = {1998},
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  pages = {315},
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  url = {https://doi.org/10.2307/2998560}
}