@article{ref1,
title="Measuring the potential for performance improvement",
journal="Training",
year="1978",
author="Gilbert, T. F.",
volume="15",
number="12",
pages="25-28",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0095-5892",
doi="",
url="http://dx.doi.org/"
}