@article{Callahan2012,
author = {Callahan, R. and Becker, S.},
title= {The reliability of calendar data for reporting contraceptive use: Evidence from rural Bangladesh},
year = {2012},
doi = {10.1111/j.1728-4465.2012.00319.x},
volume = {43},
number = {3},
pages = {213--222},
}