@article{Billari2005,
author = {Billari, F.C. and Borgoni, R. },
title= {Assessing the use of sample selection models in the estimation of fertility postponement effects},
year = {2005},
doi = {10.1007/s10260-005-0122-x},
journal = {Statistical Methods and Applications},
volume = {14},
number = {3},
pages = {389--402},
}