TY  - CHAP
A1  - Hrdy, S.B.
T1  - Cooperative breeders with an ace in the hole
Y1  - 2005
A3  - Voland, E.
A3  - Chasiotis, A.
A3  - Schiefenhovel, W. 
T2  - Grandmotherhood: The evolutionary significance of the second half of female life
CY  - New Brunswick
PB  - Rutgers University Press

ER  -