@book{Leuven2003,
author = {Leuven, E. and Sianesi, B.},
title= {PSMATCH2: Stata module to perform full mahalanobis and propensity-score matching, common support graphing, and covariate imbalance testing. Statistical Software Components S432001},
year = {2003},
address = {Newton, MA},
publisher = {Boston College Department},
}