@article{Coale1990,
author = {Coale, A.J. and Kisker, E.E.},
title= {Defects in data on old-age mortality in the United States: New procedures for calculating mortality schedules and life tables at the highest ages},
year = {1990},
journal = {Asian and Pacific Population Forum },
volume = {4},
number = {1},
pages = {1--32},
}