@article{ref1,
title="Indirect hard detectable causes for the increase of accidents",
journal="Wiadomosci Lekarskie",
year="1969",
author="Witwicki, T. and Zacharjasiewicz, I. and Ziubrynowicz, W.",
volume="22",
number="19",
pages="1759-1763",
abstract="<p>[Abstract unavailable]</p><p>Language: pl</p>",
language="pl",
issn="0043-5147",
doi="",
url="http://dx.doi.org/"
}