@article{ref1,
title="Study on working efficiency of sporting and not sporting apprentices",
journal="Ceskoslovenská Hygiena",
year="1962",
author="Glivicky, V. and Vaneckova, M.",
volume="7",
number="",
pages="139-141",
abstract="<p>[Abstract unavailable]</p><p>Language: cs</p>",
language="cs",
issn="0009-0573",
doi="",
url="http://dx.doi.org/"
}