@article{ref1,
title="Psychological effects of space flight",
journal="Aerospace medicine",
year="1961",
author="Ruff, G. E.",
volume="32",
number="",
pages="639-642",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-9402",
doi="",
url="http://dx.doi.org/"
}