@article{ref1,
title="Operational experience with a portable friction testing device in university buildings",
journal="Ergonomics",
year="1985",
author="Ballance, P. E. and Morgan, J. and Senior, D.",
volume="28",
number="7",
pages="1043-1054",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0014-0139",
doi="",
url="http://dx.doi.org/"
}