@inbook{Sobotka2008,
author = {Sobotka, T.},
title= {Does persistent low fertility threaten the future of European populations},
year = {2008},
editor = {Surkyn, J.},
editor = {Deboosere, P.},
editor = {Van Bavel, J. },
booktitle = {Demographic challenges for the 21st century: A state of the art in demography},
address = {Brussels},
publisher = {VUB Press Brussels University Press},
pages = {27--90},
}