@article{Wiener1990,
author = {Wiener, J.M. and Hanley, R.J. and Clark, R. and Van Nostrand, J.F. },
title= {Measuring the activities of daily living: Comparisons across national surveys},
year = {1990},
journal = {Journal of Gerontology: Social sciences },
volume = {45},
number = {6},
pages = {229--237},
}