@article{Menken1979,
author = {Menken, J.},
title= {Seasonal Migration and Seasonal Variation in Fecundability: Effects on Birth Rates and Birth Intervals},
year = {1979},
doi = {10.2307/2061082},
journal = {Demography},
volume = {16},
number = {1},
pages = {103--119},
}