@article{Laditka1998,
author = {Laditka, S.B. and Wolf, D.A.},
title= {New methods for analyzing active life expectancy},
year = {1998},
doi = {10.1177/089826439801000206},
journal = {Journal of Aging and Health},
volume = {10},
number = {2},
pages = {214--241},
}