@inbook{Willekens1999,
author = {Willekens, F.},
title= {Life course: Models and analysis},
year = {1999},
doi = {10.1007/978-94-011-4389-9_2},
editor = {van Wissen, L.J.G.},
editor = {Dykstra, P.A.},
booktitle = {Population issues: An interdisciplinary focus},
address = {New York},
publisher = {Plenum Press},
pages = {23--51},
}