@article{Rogers1989,
author = {Rogers, R.G. and Rogers, A. and Belanger, A.},
title= {Active life among the elderly in the United States: Multistate life-table estimates and population projections},
year = {1989},
doi = {10.2307/3350221},
volume = {67},
number = {3–4},
pages = {370--411},
}