@article{Kannisto1994,
author = {Kannisto, V. and Lauristen, J. and Thatcher, A.R. and Vaupel, J.W.},
title= {Reductions in mortality at advanced ages: Several decades of evidence from 27 countries},
year = {1994},
doi = {10.2307/2137662},
journal = {Population and Development Review},
volume = {20},
number = {4},
pages = {793--810},
}