@article{ref1,
title="Head hitting in severely retarded children",
journal="American journal of nursing",
year="1974",
author="Geiger, J. K. and Barnes, C. M. and Sindberg, R. M.",
volume="74",
number="10",
pages="1822-1825",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-936X",
doi="",
url="http://dx.doi.org/"
}