@article{Cheung2005,
author = {Cheung, Siu Lan Karen and Robine, textnormalJ M. and Tu, Edward Jow-Ching and Caselli, Graziella},
title= {Three dimensions of the survival curve: Horizontalization, verticalization, and longevity extension},
year = {2005},
doi = {10.1353/dem.2005.0012},
volume = {42},
number = {2},
pages = {243--258},
}