@article{Iacus2012,
author = {Iacus, S.M. and King, G. and Porro, G.},
title= {Causal inference without balance checking: Coarsened exact matching},
year = {2012},
doi = {10.1093/pan/mpr013},
journal = {Political Analysis },
volume = {20},
number = {1},
pages = {1--24},
}