TY  - JOUR
A1  - Strassmann, B.I. 
T1  - Cooperation and competition in a cliff-dwelling people
Y1  - 2011
DO  - 10.1073/pnas.1100306108
JF  - Proceedings of the National Academy of Sciences of the United States of America 
VL  - 108
IS  - S2

ER  -