@article{ref1,
title="Surfers' "knots"",
journal="JAMA journal of the American Medical Association",
year="1965",
author="Swift, S.",
volume="192",
number="",
pages="223-224",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0098-7484",
doi="",
url="http://dx.doi.org/"
}