BibTex format
@article{McCandless:2012:10.1080/01621459.2011.643739,
author = {McCandless, L and Richardson, S and Best, N},
doi = {10.1080/01621459.2011.643739},
journal = {Journal of the American Statistical Association},
title = {Adjustment for Missing Confounders Using External Validation Data and Propensity Scores},
url = {http://dx.doi.org/10.1080/01621459.2011.643739},
year = {2012}
}