@article{ref1,
title="Physiological and hygienic evaluation of air cleansing deep coal mines",
journal="Gigiena Truda i Professional'nye Zabolevaniia",
year="1981",
author="Soldak, I. I.",
volume="",
number="3",
pages="24-27",
abstract="<p>[Abstract unavailable]</p><p>Language: ru</p>",
language="ru",
issn="0016-9919",
doi="",
url="http://dx.doi.org/"
}