@article{ref1,
title="Systems analysis and occupational health",
journal="American journal of public health",
year="1970",
author="Akman, A. and Gordon, J. B.",
volume="60",
number="9",
pages="1749-1759",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0090-0036",
doi="",
url="http://dx.doi.org/"
}