@article{ref1,
title="Frustration and task complexity: an extension of frustration theory",
journal="Journal of experimental psychology",
year="1972",
author="Libb, J. W.",
volume="96",
number="1",
pages="67-72",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0022-1015",
doi="",
url="http://dx.doi.org/"
}