TY  - JOUR
A1  - Coall, D.A.
A1  - Meier, M.
A1  - Hertwig, R.
A1  - Wanke, M.
A1  - Hopflinger, F. 
T1  - Grandparental investment: The influence of reproductive timing and family size
Y1  - 2009
DO  - 10.1002/ajhb.20894
JF  - American Journal of Human Biology
VL  - 21
IS  - 4
SP  - 455
EP  - -463

ER  -