@article{ref1,
title="Changes in the psychophysical fitness of schoolchildren during a 5-day school week",
journal="Roczniki Panstwowego Zakladu Higieny",
year="1985",
author="Zdunkiewicz, L. and Goryński, P. and Polus-Szeniawska, E.",
volume="36",
number="5",
pages="411-415",
abstract="<p>[Abstract unavailable]</p><p>Language: pl</p>",
language="pl",
issn="0035-7715",
doi="",
url="http://dx.doi.org/"
}