@article{Hammel2005c,
author = {Hammel, E.A.},
title= {Kinship-based politics and the optimal size of kin groups},
year = {2005c},
doi = {10.1073/pnas.0504647102},
journal = {Proceedings of The National Academy of Sciences, USA},
volume = {102},
number = {3},
pages = {11951--11956},
}