@article{ref1,
title="Lost time back injuries: their rrelationship to heavy work and preplacement back x-rays",
journal="Journal of Occupational Medicine",
year="1972",
author="Harley, W. J.",
volume="14",
number="8",
pages="611-614",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0096-1736",
doi="",
url="http://dx.doi.org/"
}