@article{Vaupel2003,
author = {Vaupel, JamesW. and Canudas-Romo, Vladimir},
title= {Decomposing change in life expectancy: A bouquet of formulas in honor of Nathan Keyfitz’s 90th birthday},
year = {2003},
doi = {10.1353/dem.2003.0018},
journal = {Demography},
volume = {40},
number = {2},
pages = {201--216},
}