@article{White1996,
author = {White, K.M. and Preston, S.H. },
title= {How many Americans are Alive because of Twentieth-Century Improvements in Mortality? },
year = {1996},
doi = {10.2307/2137714},
journal = {Population and Development Review },
volume = {22},
number = {3},
pages = {415--429},
}