1. Sources of noise in impact forming machines;Sadek,1973
2. Impact sound by mutual collision of two steel balls;Nishimura;Bulletin of the Japanese Society of Precision Engineering,1963
3. Noise due to an air ejection from clash surfaces of an impact forming machine;Trengrouse,1973
4. Noise and vibration analysis of an impact forming machine;Osman;Transactions of the American Society of Mechanical Engineers Journal of Engineering for Industry,1974
5. Theoretical Acoustics;Morse,1968