TY  - CHAP
A1  - Gray, R.
T1  - Biological factors other than nutrition and lactation which may influence natural fertility: A review
Y1  - 1979
A3  - Leridon, H.
A3  - Menken, J.
T2  - Patterns and Determinants of Natural Fertility
CY  - Liège
PB  - Ordina editions

ER  -