@inproceedings{Billari2009c,
author = "Billari, F.-C. and Kohler, H. P.",
title = "Fertility and happiness in the XXI century: institutions, preferences, and their interactions",
year = 2009,
booktitle = "XXVI IUSSP International Population Conference 2009",
month = "Sep",
url = "http://iussp2009.princeton.edu/download.aspx?submissionId=93347"
}