@article{ref1,
title="Varied environmental conditions and task performance by mentally retarded subjects perceived as distractible and nondistractible",
journal="American journal of mental deficiency",
year="1974",
author="Somervill, J. W. and Jacobsen, L. and Warnberg, L. and Young, William",
volume="79",
number="2",
pages="204-209",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9351",
doi="",
url="http://dx.doi.org/"
}