YOSHIOKA, T. Plastic Risaikuru no Genjyou to Mirai. Kankyo Recycle Gijyutsu. Handbook. 1999, 9-16
Research Association for Feedstock Recycling of Plastics, Japan. Proceedings of the 1st International Symposium on Feedstock Recycling of Plastics. 1999
Plastic Waste Management Institute, Japan. http://www.pwmi.or.jp/ei/ei00.htm