@article{Delgado Pérez1992,
author = {Delgado Pérez, M. and Livi Bacci, M.},
title= {Fertility in Italy and Spain: the lowest in the world},
year = {1992},
doi = {10.2307/2136019},
journal = {Family Planning Perspectives },
volume = {24},
number = {4},
pages = {162--171},
}