@article{Clayton1978,
author = {Clayton, D.G.},
title= {A model for association in bivariate life tables and its application in epidemiological studies of familial tendency in chronic disease incidence},
year = {1978},
doi = {10.1093/biomet/65.1.141},
journal = {Biometrika},
volume = {65},
number = {1},
pages = {141--151},
}