@article{Gibson2005,
author = {Gibson, M.A. and Mace, R.},
title= {Helpful grandmothers in rural Ethiopia: A study of the effect of kin on child survival and growth},
year = {2005},
doi = {10.1016/j.evolhumbehav.2005.03.004},
journal = {Evolution and Human Behavior},
volume = {26},
number = {6},
pages = {469--482},
}