@article{ref1,
title="Health and educational problems of the extracurricular activities of school children",
journal="Vestnik Akademii Meditsinskikh Nauk SSSR",
year="1972",
author="Boiarskiĭ, A. P. and Shabunin, R. A. and Istomin, P. I.",
volume="27",
number="5",
pages="3-9",
abstract="<p>[Abstract unavailable]</p><p>Language: ru</p>",
language="ru",
issn="0002-3027",
doi="",
url="http://dx.doi.org/"
}