@article{Billari2006,
author = {Billari, F.C. and Liefbroer, A.C. and Philipov, D.},
title= {The Postponement of Childbearing in Europe: Driving Forces and Implications},
year = {2006},
journal = {Vienna Yearbook of Population Research},
volume = {4},
number = {1},
pages = {1--17},
}