@article{ref1,
title="Medical control over the physical education of schoolchildren",
journal="Feldsher i Akusherka",
year="1979",
author="Koval'chuk, E. N. and Prokof'eva, N. G.",
volume="44",
number="9",
pages="6-11",
abstract="<p>[Abstract unavailable]</p><p>Language: ru</p>",
language="ru",
issn="0014-9772",
doi="",
url="http://dx.doi.org/"
}