@article{Caselli1990,
author = {Caselli, G. and Vallin, J.},
title= {Mortality and population ageing},
year = {1990},
doi = {10.1007/BF01796797},
URL = {http://dx.doi.org/10.1007/BF01796797},
volume = {6},
number = {1},
pages = {1--25},
}