@article{Umberson1992,
author = {Umberson, D. and Wortman, C.B. and Kessler, R.C.},
title= {Widowhood and depression: Explaining long-term gender differences in vulnerability},
year = {1992},
doi = {10.2307/2136854},
volume = {33},
number = {1},
pages = {10‒24},
}