TY  - CHAP
A1  - Lazarus, J. 
T1  - Human sex ratios: Adaptations and mechanisms, problems and prospects
Y1  - 2002
DO  - 10.1017/CBO9780511542053.015
A3  - Hardy, I.C.W. 
T2  - Sex Ratios: Concepts and Research Methods
CY  - Cambridge 
PB  - Cambridge University Press

ER  -