@article{Billari2002,
author = {Billari, F.C. and Borgoni, R.},
title= {Spatial profile in the analysis of event histories: an application to first sexual intercourse in Italy},
year = {2002},
doi = {10.1002/ijpg.262},
journal = {International Journal of Population Geography},
volume = {8},
number = {4},
pages = {261--275},
}