@article{Liefbroer2010,
author = {Liefbroer, A.C. and Billari, F.C. },
title= {Bringing norms back in. A theoretical and empirical discussion of their importance of understanding demographic behaviour},
year = {2010},
doi = {10.1002/psp.552 },
journal = {Population, Space and Place},
volume = {16},
pages = {287--305},
}