@article{ref1,
title="Observations on heart rate and cardiodynamics during weightlessness",
journal="Aerospace medicine",
year="1960",
author="Burch, G. E. and Gerathewohl, S. J.",
volume="31",
number="",
pages="661-669",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}