KingA. J.‘The reduction of noise and the vibration of machines’, Nat. Phys. Lab. Symposium No. 12, The control of noise, Paper C-3 (H.M. Stationery Office, London).
3.
CopelandW. C.‘Reduction of noise from ground running aero engines’, Nat. Phys. Lab. Symposium No. 12, The control of noise, Paper D-2 (H.M. Stationery Office, London).