@article{ref1,
title="Toxicity of the tetrachlorodifluoroethanes",
journal="Archives of industrial hygiene and occupational medicine",
year="1950",
author="Greenberg, L. A. and Lester, David",
volume="2",
number="3",
pages="345-347",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0376-1096",
doi="",
url="http://dx.doi.org/"
}