@article{ref1,
title="Occupational fitness of adolescents and the class-3 occupation of tractor and engine driver",
journal="Medicinskaja Sestra",
year="1971",
author="Besstrashnaia, N. A.",
volume="30",
number="11",
pages="43-46",
abstract="<p>[Abstract unavailable]</p><p>Language: ru</p>",
language="ru",
issn="0025-8342",
doi="",
url="http://dx.doi.org/"
}