1. 3) Mitsubishi Rayon Co., Ltd., J Published unexamined patent application, 61-119770 (1986.6.6). [in Japanese]
2. 4) T. Yoshikawa, RTRI Report, 5(11), 19 (1991). [in Japanese]
3. 5) E. Yasuda, Zairyogijutsu, 12(9), 278 (1994). [in Japanese]
4. Ozone treatment of carbon fiber for reinforcing cement
5. 7) Toho Tenax Co., Ltd., J Patent Gazette, 3547824 (2004.4.23). [in Japanese]