1. K. Suzuki, et al.: 15th Int. Forgemasters Meeting, Japan, 2003.
2. Technology for the Production of High Quality Large Ring Forgings
3. S. Onodera, et al.: The 3rd MPASeminar, Stuttgart, F. R. of Germany, 1977
4. T. Takenouchi, et al.: 1st Int. Forgemasters Meeting, Italy, 1991