1. An acoustic telescope;Billingsley;Aeronautical Research Council Report ARC 35/344,1974
2. The acoustic telescope;Billingsley;Journal of Sound and Vibration,1976
3. The analysis of real-time acoustic signals using a minicomputer;Billingsley,1976
4. Jet engine noise source location: the polar correlation technique;Fisher;Journal of Sound and Vibration,1977
5. The shielding method for noise source location and a review of alternative methods;Damms,1977