@article{ref1,
title="The effect of three variables on the verbal problem solving of educable mentally handicapped children",
journal="American journal of mental deficiency",
year="1972",
author="Goodstein, H. A. and Bessant, H. and Thibodeau, G. and Vitello, S. and Vlahakos, I.",
volume="76",
number="6",
pages="703-709",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9351",
doi="",
url="http://dx.doi.org/"
}