@article{ref1,
title="The hazard of accidents in coal mines",
journal="Chirurgia Narzadow Ruchu i Ortopedia Polska",
year="1964",
author="Wanat, J.",
volume="29",
number="",
pages="567-573",
abstract="<p>[Abstract unavailable]</p><p>Language: pl</p>",
language="pl",
issn="0009-479X",
doi="",
url="http://dx.doi.org/"
}