@article{ref1,
title="Medical problems of civil air traffic",
journal="Nordisk Medicin",
year="1971",
author="Hagelsten, J. O. and Jessen, K.",
volume="86",
number="48",
pages="1409-1415",
abstract="<p>[Abstract unavailable]</p><p>Language: da</p>",
language="da",
issn="0029-1420",
doi="",
url="http://dx.doi.org/"
}