@article{Gottard2015,
author = {Gottard, A. and Mattei, A. and Vignoli, D. },
title= {The relationship between education and fertility in the presence of a time varying frailty component},
year = {2015},
doi = {10.1111/rssa.12097},
journal = {Journal of the Royal Statistical Society, Series A },
volume = {178},
number = {4},
pages = {863--881},
}