@article{ref1,
title="Problem: "Work--fatigue--rest"",
journal="Przeglad Lekarski",
year="1969",
author="Papierkowski, J.",
volume="25",
number="9",
pages="625-629",
abstract="<p>[Abstract unavailable]</p><p>Language: pl</p>",
language="pl",
issn="0033-2240",
doi="",
url="http://dx.doi.org/"
}