@article{berta2017cem,
  title={\%{CEM}: a {SAS} macro to perform {C}oarsened {E}xact {M}atching},
  author={Berta, Paolo and Bossi, Matteo and Verzillo, Stefano},
  journal={Journal of Statistical Computation and Simulation},
  volume={87},
  number={2},
  pages={227--238},
  year={2017},
  publisher={Taylor \& Francis}
}

%18

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