TY  - JOUR
A1  - Bongaarts, J.
A1  - Potter, R.G.
T1  - Fertility effect of seasonal migration and seasonal variation in fecundability: Test of a useful approximation under more general conditions
Y1  - 1979
DO  - 10.2307/2061226
JF  - Demography
VL  - 16
IS  - 3
SP  - 475
EP  - -479

ER  -