@article{Smith1990,
author = {Smith, L.A. and Branch, L.G. and Scheer, P.A. and Wetle, T. and Evans, D.E. and Hebert, L. and Taylor, J.O.},
title= {Short-term variability of measures of physical function in older people},
year = {1990},
journal = {Journal of American Geriatrics Society},
volume = {38},
number = {9},
pages = {993--998},
}