1. 1) Ministry of the Environment: Report of Discharge and Disposal Situation of Industrial Waste of Japan in 2002, (in Japanese), (2005), pp.1-42.
2. 2) Plastic Waste Management Institute: Disposal and Recycling of waste Plastics, (in Japanese), (2005), http://www.pwmi.or.jp.
3. 3) Kagaku-Kougyo-Sha: Hai-Purasutikku no Yuko-Jiturei-shu, (Kagaku-Kougyo-Sha, Tokyo, 1973), pp.10-11.
4. 4) Y. Fukumoto, M. Kodama and K. Kamegawa: Tanso, 188 (1999), 138-142.
5. 5) K. Kawarada, H. Nakanami, T. Iida, T. Okayama, T. Waku and A. Enomoto: Haikibutu Gakkai Ronbunshi, 14 (2003), 36-42.