@article{Bird2000,
author = {Bird, S.T. and Chandra, A. and Bennett, T. and Harvey, S.M.},
title= {Beyond marital status: Relationship type and duration and the risk of low birth weight},
year = {2000},
doi = {10.2307/2648196},
journal = {Family Planning Perspectives},
volume = {32},
number = {6},
pages = {281--287},
}