@article{ref1,
title="The work schedule of river boat crews with combined duties",
journal="Gigiena Truda i Professional'nye Zabolevaniia",
year="1968",
author="Steĭmatskiĭ, A. R.",
volume="12",
number="3",
pages="7-12",
abstract="<p>[Abstract unavailable]</p><p>Language: ru</p>",
language="ru",
issn="0016-9919",
doi="",
url="http://dx.doi.org/"
}