1. 1) Ohsawa, Z. Ed. : “Koubunshi Zairyou no Rekka to Anteika”, CMC, Tokyo, p.7, p.15, p.37 (1990)
2. 2) Rubber Digest Sha Ed. : “Binran Gomu Plastic Haigou Yakuhin Shinteiban”, Rubber Digest Sha, Tokyo, p.69 (2001)
3. 3) Ohkatsu, Y. : Nippon Gomu Kyokai 83rd Gomu Gijutsu Symposium Youshisyu, p.1 (2002)
4. 4) Sawatari, K. ; Nishino, T. ; Tabata, Y. : “Sankabousizai Handbook”, Taiseisha, Tokyo, p.4, p.27, p.37 (1976)
5. 5) Maeda, M. : In“Gomu Gijutsu no Kiso”, Nippon Gomu Kyokai Ed., Nippon Gomu Kyokai, Tokyo, p.100 (1983)