@article{ref1,
title="Fatigue in aircrew. Observations in the Berlin airlift",
journal="Lancet",
year="1951",
author="STANBRIDGE, R. H.",
volume="2",
number="6671",
pages="1-3",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0140-6736",
doi="",
url="http://dx.doi.org/"
}