@article{ref1,
title="Frames of Reference for Helicopter Electronic Maps: The Relevance of Spatial Cognition and Componential Analysis",
journal="International journal of aviation psychology",
year="1991",
author="Harwood, K. and Wickens, Christopher D.",
volume="1",
number="1",
pages="5-23",
abstract="[Abstract unavailable]  <p>Language: en</p>",
language="en",
issn="1050-8414",
doi="10.1207/s15327108ijap0101_2",
url="http://dx.doi.org/10.1207/s15327108ijap0101_2"
}