@article{ref1,
title="Under water swimming with breathing mask",
journal="Tidsskrift for den Norske Laegeforening",
year="1957",
author="Sebelien, J.",
volume="77",
number="12",
pages="503-508",
abstract="Abstract unavailable.",
language="",
issn="0029-2001",
doi="",
url="http://dx.doi.org/"
}