@article{Sear2011,
author = {Sear, R. and Coall, D. },
title= {How much does family matter? Cooperative breeding and the demographic transition},
year = {2011},
doi = {10.1111/j.1728-4457.2011.00379.x},
journal = {Population and Development Review},
volume = {37},
number = {Suppl. 1},
pages = {81--112},
}