TY  - JOUR
A1  - Danielsbacka, M.
A1  - Tanskanen, A.O.
A1  - Jokela, M.
A1  - Rotkirch, A.
T1  - Grandparental child care in Europe: Evidence for preferential investment in more certain kin
Y1  - 2011
JF  - Evolutionary Psychology 
VL  - 9
IS  - 1

ER  -