@article{ref1,
title="The present status of the problem of weightlessness",
journal="Texas state journal of medicine",
year="1959",
author="Campbell, P. A. and Gerathewohl, S. J.",
volume="55",
number="4",
pages="267-274",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0096-7165",
doi="",
url="http://dx.doi.org/"
}