@article{Caselli2006,
author = {Caselli, G. and Lipsi, R. M.},
title= {Survival differences among the oldest old in Sardinia: Who, what, where, and why},
year = {2006},
doi = {10.4054/DemRes.2006.14.13},
journal = {Demographic Research},
volume = {14},
number = {13},
pages = {267--294},
}