TY  - SER
AU  - Cox, S. J.
TI  - Group Size, Memory, and interaction rate in the evolution of Cooperation
T2  - Current Anthropolgy, Suplement ; 
PY  - 1999///
CY  - Chicago-US : 
PB  - Department of Human Sciences, 
N1  - Artículo dentro de: Reports
ER  -