TY  - JOUR
A1  - Gibson, M.A.
A1  - Mace, R. 
T1  - Strong mothers bear more sons in rural Ethiopia
Y1  - 2003
DO  - 10.1098/rsbl.2003.0031
JF  - Proceedings of the Royal Society of London Series B 
VL  - 270
IS  - Supplement
SP  - 108
EP  - -109

ER  -