@article{ref1,
title="International threshold limits values--1963",
journal="American Industrial Hygiene Association journal",
year="1963",
author="Stokinger, H. E.",
volume="24",
number="",
pages="469-474",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-8894",
doi="",
url="http://dx.doi.org/"
}