@inbook{Wolf1994,
author = {Wolf, D.},
title= {The elderly and their kin: Patterns of availability and access},
year = {1994},
editor = {Martin, L.},
editor = {Preston, S.},
booktitle = {Demography of aging},
address = {Washington DC},
publisher = {National Academies Pres},
pages = {146--195},
}