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			| Robert  Hitchcock
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								S. R. Ellis, M. W. McGreevy,  & R. . Hitchcock (1987) Perspective  traffic  display format and airline pilot traffic avoidance, Human Fac-tors, 29, 371-382
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								S. R. Ellis,  & R. . Hitchcock (1986) Emergence  of Zipf's Law: Spontaneous encoding optimization by users of a command language, IEEE  Transactions on Systems Man and Cyber-netics SMC-16, 423-427
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								S. R. Ellis, M. W. McGreevy,  & R. . Hitchcock (1984) Influence of a perspective cockpit traffic display format on pilot avoidance maneuvers, Proceedings of AGARD Conference on Human Factors Considerations in High performance aircraft,  May, 1984, AGARD Paris, 16-1 16-11.
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