@article{ref1,
title="Medical problems connected with space travel. VI. The clock in the space ship",
journal="Nederlands Tijdschrift voor Geneeskunde",
year="1963",
author="Jongbloed, J.",
volume="107",
number="",
pages="1137-1138",
abstract="<p>[Abstract unavailable]</p><p>Language: nl</p>",
language="nl",
issn="0028-2162",
doi="",
url="http://dx.doi.org/"
}