@article{Kirk1998,
author = {Kirk, D.  and Pillet, B. },
title= {Fertility levels, trends, and differentials in sub-Saharan Africa in the 1980s and 1990s},
year = {1998},
doi = {10.2307/172178},
journal = {Studies in Family Planning },
volume = {29},
number = {1},
pages = {1--22},
}