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								V. . Riley, G. . Chatterji, W. W. Johnson, R. . Mogford, P. . Kopardekar, E. . Sierra, M. . Landing,  & G. F. Lawton (2004) Pilot Perceptions of Airspace Complexity. Part 2, 23rd Digital Avionics Systems Conference. Salt Lake City, UT
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								V. . Riley, E. . Sierra, R. . Mogford, W. W. Johnson, P. . Kopardekar, G. . Chatterji,  & G. F. Lawton (2003) Pilot Perceptions of Airspace Complexity, Digital Avionics Systems Conference (DASC 2003). Indianapolis, IN
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