@article{ref1,
title="Threshold limits for pesticides",
journal="AMA archives of industrial health",
year="1956",
author="Ball, W. L.",
volume="14",
number="2",
pages="178-185",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0567-3933",
doi="",
url="http://dx.doi.org/"
}