@article{ref1,
title="Systematic relaxation to reduce preoperative stress",
journal="Canadian nurse, The",
year="1972",
author="Aiken, L. H.",
volume="68",
number="6",
pages="38-42",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0008-4581",
doi="",
url="http://dx.doi.org/"
}