1. The influence of background noise level and signal duration on the judged annoyance of aircraft noise;Johnston;University of Toronto Institute for Aerospace Studies Report No. 228,1976
2. Judgments of aircraft noise in a traffic noise background;Powell;Journal of Sound and Vibration,1975
3. Annoyance due to the interaction of community noise sources;Powell;Ph.D. Dissertation, George Washington University, Washington, D.C.,1978
4. The effects of duration and background noise on perceived noisiness;Pearsons;FAA Report AD 5-78,1966
5. The effects of background noise upon perceived noisiness;Nagel;FAA Report D5-67-22,1967