@article{Barbi2003,
author = {Barbi, E. and Caselli, G. and Vallin, J.},
title= {Trajectories of extreme survival in heterogeneous populations},
year = {2003},
doi = {10.2307/3246644},
URL = {http://dx.doi.org/10.2307/3246644},
volume = {58},
number = {1},
pages = {43--66},
}