@article{ref1,
title="Age and fatal accidents at work",
journal="Polski Tygodnik Lekarski",
year="1970",
author="Koska, W.",
volume="25",
number="29",
pages="1103-1105",
abstract="<p>[Abstract unavailable]</p> <p>Language: pl</p>",
language="pl",
issn="0032-3756",
doi="",
url="http://dx.doi.org/"
}