@article{Frank1991,
author = {Frank, O. and Bongaarts, J.},
title= {Behavioural and biological determinants of fertility transition in sub-Saharan Africa},
year = {1991},
doi = {10.1002/sim.4780100203},
journal = {Statistics in Medicine},
volume = {10},
number = {2},
pages = {161--175},
}