@article{Billari2007,
author = {Billari, F.C. and Kohler, H.-P. and Andersson, G. and Lundström, H.},
title= {Approaching the Limit: Long-Term Trends in Late and Very Late Fertility},
year = {2007},
doi = {10.1111/j.1728-4457.2007.00162.x},
journal = {Population and Development Review},
volume = {33},
number = {1},
pages = {149--170},
}