@article{Abadie2011,
author = {Abadie, A. and Imbens, G.W.},
title= {Bias-corrected matching estimators for average treatment effects},
year = {2011},
doi = {10.1198/jbes.2009.07333},
journal = {Journal of Business and Economic Statistics},
volume = {29},
number = {1},
pages = {1--11},
}