@article{Iacus2009,
author = {Iacus, S. and King, G. and Porro, G.},
title= {Cem: Software for Coarsened Exact Matching},
year = {2009},
doi = {10.18637/jss.v030.i09},
journal = {Journal of Statistical Software},
volume = {30},
number = {9},
pages = {1--27},
}