1. 1) Y. Mitsuzawa and K. Ozawa: Collected Abstracts of the 73rd Meeting of Metal Finishing Society, (The Surface Finishing Society of Japan, 1986) p. 373.
2. 2) A. Yauchi, T. Usuki, T. Shiota and M. Nishihara: Tetsu-to-Hagane 72 (1986) S1313.
3. 3) T. Shiota, A. Yauchi and Y. Yoshikawa: CAMP-ISIJ 1 (1988) 679.
4. 4) Y. Kawanishi and N. Suzuki: CAMP-ISIJ 4 (1991) 1661.
5. 5) T. Katsumi, K. Saito and Y. Miyauchi: CAMP-ISIJ 5 (1992) 691.