@article{ref1,
title="Heart rate of pilots flying aircraft on scheduled airline routes",
journal="Aerospace medicine",
year="1967",
author="Smith, H. P.",
volume="38",
number="11",
pages="1117-1119",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}