@article{ref1,
title="Principles of ergonomy in dental practice",
journal="Czasopismo stomatologiczne",
year="1972",
author="Krzywicki, J.",
volume="25",
number="9",
pages="777-784",
abstract="<p>[Abstract unavailable]</p><p>Language: pl</p>",
language="pl",
issn="0011-4553",
doi="",
url="http://dx.doi.org/"
}