@article{ref1,
title="Motor response time and task difficulty among aged and brain-damaged patients",
journal="Archives of physical medicine and rehabilitation",
year="1972",
author="Zaretsky, H. H. and Brucker, B. S. and Guttman, A. R. and Mete, J.",
volume="53",
number="9",
pages="418-424",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0003-9993",
doi="",
url="http://dx.doi.org/"
}