@article{ref1,
title="The electrocardiogram of the mountaineer at high altitude",
journal="British heart journal",
year="1960",
author="Jackson, F. and Davies, Helen",
volume="22",
number="",
pages="671-685",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0007-0769",
doi="",
url="http://dx.doi.org/"
}