@article{Nettle2011,
author = {Nettle, D. and Coall, D.A. and Dickins, T.E.},
title= {Early-life conditions and age at first pregnancy in British women},
year = {2011},
doi = {10.1098/rspb.2010.1726},
volume = {278},
number = {1712},
pages = {1721--1727},
}