@article{Matthews2006,
author = {Matthews, S. and Sun, R.},
title= {Incidence of four-generation family lineages: Is timing of fertility or mortality a better explanation?},
year = {2006},
doi = {10.1093/geronb/61.2.S99},
journal = {The Journals of Gerontology: Social Sciences},
volume = {61B},
number = {2},
pages = {S99--S106},
}