@article{Crimmins1981,
author = {Crimmins, E.},
title= {The Changing Pattern of American Mortality Decline, 1940-77, and Its Implications for the Future},
year = {1981},
doi = {10.2307/1972622},
journal = {Population and Development Review},
volume = {7},
number = {2},
pages = {229--254},
}