1. E SIEBEL The plastic forming of metals. Steel October l6-May 7 1933–34.
2. W SCHROEDER and D A WEBSTER Press forging thin sections. Journal of Applied Mechanics, September 1949.
3. J A SCHEY Principles of forging design IITRI review for American Iron and Steel Industry.
4. A GELEJI Forge equipment, rolling mills and accessories. Akademiai Budapest 1967.
5. A REBEL’SKII Technical Handbook on forging and drop forging. Moscow 1959