@article{ref1,
title="The use of subjective rating",
journal="Ergonomics",
year="1971",
author="Philipp, U. and Reiche, D. and Kirchner, J. H.",
volume="14",
number="5",
pages="611-616",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0014-0139",
doi="10.1080/00140137108931282",
url="http://dx.doi.org/10.1080/00140137108931282"
}