1. 1) Y. Akao: "Basic Electromagnetic Environmental Engineering", Denshi Joho Tsushin Gakkai, (EiC), (1993) 1.
2. 2) O. Hashimoto: "Electromagnetic Absorber for Wireless Age", Industrial Materials, 50 (2002) 17-65.
3. 3) O. Hashimoto: "Recent Technologies for New Wave Absorber and Its Applications", CMC, (1999) 27-33, 77-87.
4. 4) M. Miki, T. Kikuchi, M. Nakamura, K. Hatakeyama and J. Takada: "Electromagnetic Wave Absorption Characteristics of Woodceramics", Trans. Mater. Res. Soc. Jpn., 26 (2001) 867-870.