@article{ref1,
title="The Value of Spatial Cues in 3D Air Traffic Displays",
journal="International journal of aviation psychology",
year="2007",
author="Alm, Torbjörn and Lif, Patrik",
volume="17",
number="2",
pages="109-129",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="1050-8414",
doi="10.1080/10508410701328490",
url="http://dx.doi.org/10.1080/10508410701328490"
}