@article{ref1,
title="Morbidity and injuries of Petersburg workers in the beginning of the 20th century",
journal="Gigiena Truda i Professional'nye Zabolevaniia",
year="1966",
author="Semanov, S. N.",
volume="10",
number="2",
pages="42-46",
abstract="<p>[Abstract unavailable]</p><p>Language: ru</p>",
language="ru",
issn="0016-9919",
doi="",
url="http://dx.doi.org/"
}