@article{ref1,
title="Why the elderly fall",
journal="American journal of nursing",
year="1979",
author="Witte, N. S.",
volume="79",
number="11",
pages="1950-1952",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-936X",
doi="",
url="http://dx.doi.org/"
}