@article{ref1,
title="Physical recreation and mental health",
journal="Przeglad Lekarski",
year="1971",
author="Grochmal, S. and Kepiński, A.",
volume="28",
number="7",
pages="494-496",
abstract="<p>[Abstract unavailable]</p><p>Language: pl</p>",
language="pl",
issn="0033-2240",
doi="",
url="http://dx.doi.org/"
}