TY  - JOUR
A1  - Kaplan, H.S.
A1  - Hooper, P.L.
A1  - Gurven, M. 
T1  - The evolutionary and ecological roots of human social organization
Y1  - 2009
DO  - 10.1098/rstb.2009.0115
JF  - Philosophical Transactions of the Royal Society B: Biological Sciences 
VL  - 364
IS  - 1533

ER  -