@article{Hagen2006,
author = {Hagen, E.H. and Barrett, H.C. and Price, M.E.},
title= {Do human parents face a quantity-quality tradeoff?: Evidence form a Shuar community},
year = {2006},
doi = {10.1002/ajpa.20272.},
journal = {American Journal of Physical Anthopology},
volume = {130},
pages = {405--418},
}