@article{ref1,
title="Causes of loss of consciousness during underwater swimming",
journal="Journal of applied physiology (APS DC)",
year="1961",
author="Craig, A. B.",
volume="16",
number="",
pages="583-586",
abstract="unavailable.  Keywords: Drowning; Drowning Prevention; Water Safety",
language="en",
issn="0021-8987",
doi="",
url="http://dx.doi.org/"
}