@article{Liu2012,
author = {Liu, Jianghua and Rotkirch, Anna and Lummaa, Virpi},
title= {Maternal Risk of Breeding Failure Remained Low throughout the Demographic Transitions in Fertility and Age at First Reproduction in Finland},
year = {2012},
journal = {PLoS ONE},
volume = {7},
number = {4},
pages = {e34898},
}