@article{ref1,
title="Extension injuries of the cervical spine",
journal="Chirurgia Narzadow Ruchu i Ortopedia Polska",
year="1976",
author="Kiwerski, J. E.",
volume="41",
number="3",
pages="233-237",
abstract="<p>[Abstract unavailable]</p><p>Language: pl</p>",
language="pl",
issn="0009-479X",
doi="",
url="http://dx.doi.org/"
}