@article{ref1,
title="The process of recovery: patterns in industrial back injury. 1. Costs and other quantitative measures of effort",
journal="Industrial medicine and surgery",
year="1971",
author="Leavitt, S. S. and Johnston, T. L. and Beyer, R. D.",
volume="40",
number="8",
pages="7-14",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0019-8536",
doi="",
url="http://dx.doi.org/"
}