@article{ref1,
title="On the traumatic etiology of tumor formation with a report on 49 observations",
journal="Khirurgiia",
year="1963",
author="Grigorev, G. and Grigorova, D.",
volume="16",
number="",
pages="355-361",
abstract="<p>[Abstract unavailable]</p><p>Language: bg</p>",
language="bg",
issn="0450-2167",
doi="",
url="http://dx.doi.org/"
}