@article{ref1,
title="Changes in working disposition in the course of the week in children of the 7th grade of an elementary school",
journal="Roczniki Panstwowego Zakladu Higieny",
year="1977",
author="Zdunkiewicz, L. and Kuczyńska, A.",
volume="28",
number="5",
pages="515-521",
abstract="<p>[Abstract unavailable]</p><p>Language: pl</p>",
language="pl",
issn="0035-7715",
doi="",
url="http://dx.doi.org/"
}