@article{Crimmins1989,
author = {Crimmins, E. M. and Saito, Y. and Ingegneri, D.},
title= {Changes in life expectancy and disability-free life expectancy in the United States},
year = {1989},
doi = {10.2307/1973704},
journal = {Population and Development Review},
volume = {15},
pages = {235--267},
}