@article{ref1,
title="Modern concepts of shock (a review)",
journal="Khirurgiia",
year="1977",
author="Filipov, S.",
volume="30",
number="4",
pages="336-342",
abstract="<p>[Abstract unavailable]</p><p>Language: bg</p>",
language="bg",
issn="0450-2167",
doi="",
url="http://dx.doi.org/"
}