@article{ref1,
title="Importance of breaks in working with vibration-hazardous instruments",
journal="Gigiena Truda i Professional'nye Zabolevaniia",
year="1981",
author="Butkovskaia, Z. M. and Dol'nik, R. I. and Safonova, A. F.",
volume="",
number="10",
pages="40-43",
abstract="<p>[Abstract unavailable]</p><p>Language: ru</p>",
language="ru",
issn="0016-9919",
doi="",
url="http://dx.doi.org/"
}