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2. Possible Confusions amongst a set of Auditory Warnings Signals Developed for Helicopters;Chillery,1986
3. Confusion Experiments on Auditory Warning Signals Developed for the Sea King Helicopter;Chillery,1988
4. Auditory Warnings for the European Fighter Aircraft;Edworthy;Report on British Aerospace project No. 6012CA,1992
5. Auditory warning design: the ergonomics of perceived urgency;Edworthy;Contemporary Ergonomics 1990,1990