@article{ref1,
title="A method for measuring the heart rate while diving",
journal="CA: a cancer journal for clinicians",
year="1973",
author="Frauendorf, H. and Gelbrich, W. and Lindner, H. J.",
volume="23",
number="4",
pages="259-261",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0007-9235",
doi="",
url="http://dx.doi.org/"
}