@article{Angeles1998,
author = {Angeles, G. and Guilkey, D.K. and Mroz, T.A.},
title= {Purposive program placement and the estimation of family planning program effects in Tanzania},
year = {1998},
doi = {10.2307/2669827},
journal = {Journal of the American Statistical Association},
volume = {93},
number = {443},
pages = {884--899},
}