@inbook{Uhlenberg1993,
author = {Uhlenberg, P. },
title= {Demographic change and kin relationships in later life},
year = {1993},
editor = {Maddox, G.L. },
editor = {Powell Lawton, M. },
booktitle = {Annual Review of Gerontology and Geriatrics},
address = {New York},
publisher = {Springer},
pages = {219−238},
}