@article{ref1,
title="Factor groupings of problem behaviors",
journal="American journal of mental deficiency",
year="1971",
author="Ross, R. T.",
volume="76",
number="1",
pages="136-137",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9351",
doi="",
url="http://dx.doi.org/"
}