@article{Sear2011,
author = {Sear, R. and Coall, D.A.},
title= {How much does family matter? Cooperative breeding and the demographic transition},
year = {2011},
doi = {10.1111/j.1728-4457.2011.00379.x},
volume = {37},
number = {S1},
pages = {81--112},
}