@article{Pollard2002,
author = {Pollard, M. and Morgan, S.P.},
title= {Emerging parental gender indifference? Sex composition of children and the third birth},
year = {2002},
doi = {10.2307/3088947},
journal = {American Sociological Review},
volume = {67},
number = {4},
pages = {600--613},
}