@article{ref1,
title="Nonpenetrating cardiac injuries: a collective review",
journal="American heart journal",
year="1973",
author="Liedtke, A. J. and DeMuth, W. E.",
volume="86",
number="5",
pages="687-697",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-8703",
doi="",
url="http://dx.doi.org/"
}