@article{Manton1995,
author = {Manton, K.G. and Vaupel, J.W.},
title= {Survival after the age of 80 in the United States, Sweden, France, England, and Japan},
year = {1995},
doi = {10.1056/NEJM199511023331824},
volume = {333},
number = {18},
pages = {1232--1235},
}