@article{Abadie2004,
author = {Abadie, A. and Drukker, D. and Herr, J.L. and Imbens, G.W.},
title= {Implementing matching estimators for average treatment effects in Stata},
year = {2004},
journal = {The Stata Journal},
volume = {4},
number = {3},
pages = {290--311},
}