@article{ref1,
title="Measurements of the Increases in Cruising Speed of Air Traffic",
journal="Zeitschrift des Vereines Deutscher Ingenieure",
year="1931",
author="No Author(s) Listed, ",
volume="75",
number="",
pages="1364-1364",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0341-7255",
doi="",
url="http://dx.doi.org/"
}