1. E. Weston, National Acoustics Laboratories, NSW, Australia, personal communication
2. A review of impact noise;Akay;Acoust. Soc. Amer. J.,1978
3. Transient sound radiated by spheres undergoing an elastic collision;Koss;J. Sound Vibr.,1973
4. Acoustic radiation from the elastic impact of a sphere with a slab;Akay;Applied Acoustics,1978
5. A. Akay, Wayne State University, Detroit, Michigan, personal communication (July 1981)