1. 1) S. Ibaraki: Bull. Iron Steel Inst. Japan (Ferrum) 21 (2016) 106–112.
2. 2) Y. Koyanagi: Bull. Iron Steel Inst. Japan (Ferrum) 21 (2016) 113–117.
3. 3) K. Nishino, H. Kawaura, K. Tanaka, T. Horie, T. Saito and H. Uchida: R&D Review of Toyota CRDL 35 (2000) 27–33.
4. 4) T. Tanaka and Y. Kamitakahara: Kobelco Technol. Rev. 1 (2016) 79–83.
5. 5) A.P. Jackson, G.R. Wallace and S.P. Midson: Adv. Mater. Proc. Apr. (2010) 19–22.