1. Control of noise in forging operation;Evensen;Forging Industry Educational and Research Foundation, Cleveland, Ohio, U.S.A., Industrial Noise Control Research Project, Quarterly Reports,1973
2. Engineering guideline to forging noise control;Lord;Forging Industry Educational and Research Foundation, Cleveland, Ohio, U.S.A.,1977
3. Final report for the development project: noise-attenuated forging hammers. (Translation.);Mintrop;Institut für Messtechnik in Machinenbau, T.-U. Hannover,1974
4. Impulformige Luftdruckwellen durch Gesenkbewegung bei Schmiedehammern;Brandt;Institut für Messtechnik in Machinenbau, T.-U. Hannover,1975
5. The fundamentals of noise generated in impact forming machines;Grigorian,1972