@article{Smith1994,
author = {Smith, K.R. and Zick, C.D.},
title= {Linked lives, dependent demise? Survival analysis of husbands and wives},
year = {1994},
doi = {10.2307/2061909},
journal = {Demography},
volume = {31},
number = {1},
pages = {81--93},
}