@article{Freedman2007,
author = {Freedman, V. and Schoeni, R. and Martin, L.},
title= {Chronic conditions and the decline in late-life disability},
year = {2007},
doi = {10.1353/dem.2007.0026},
journal = {Demography},
volume = {44},
number = {3},
pages = {459--477},
}