@article{ref1,
title="Injuries of the cervical spine with special reference to spines with previously existing pathologic changes",
journal="Chirurgia Narzadow Ruchu i Ortopedia Polska",
year="1972",
author="Pizio, Z. and Machowski, K.",
volume="37",
number="4",
pages="423-430",
abstract="<p>[Abstract unavailable]</p><p>Language: pl</p>",
language="pl",
issn="0009-479X",
doi="",
url="http://dx.doi.org/"
}