1. Recent developments in cold and warm precision forging technology;Raghupathi;SME Tech. Paper MFR82-10,1982
2. Y. Tanaka and T. Altan, Status of cold forging in Japan, Private Communication, Nichidai Corporation, Kyoto, Japan.
3. Basics and application of radial extrusion;Geiger,1983
4. State of the art and development trends in cold forging technology;Geiger,1987
5. Radial extrusion of flanges on steel cylindrical workpieces;Schätzle,1987