European Environment Agency, “European Topic Center on Waste, Waste Generation and Management—Envi- ronment in the EU at the Turn of the Century,” Copenhagen, 1999. http://www.eea.europa.eu/publications/92-9157-202-0/page307.html
 W. Ding, J. Laing and L. L. Andersen, “Thermal and Catalytic Degradation of High Density Polyethylene and Commingled Post-Consumer Plastic Waste,” Fuel Processing Technology, Vol. 51, No. 1-2, 1997, pp. 47-62.
 Z. Zhibo, S. Nishio, Y. Moriaka, A. Ueno, H. Ohkita, Y. Tochihara, Y. Mizushima and N. Kakuta, “Thermal and Chemical Recycle of Waste Polymers,” Catalysis Today, Vol. 29, No. 1-4, 1996, pp. 303-308.
 Y. Uemichi, M. Hattori, T. Itoh, J. Nakamura and M. Sugioka, “Deactivation Behaviors of Zeolite and Silica-Alumina Catalysts in the Degradation of Polyethylene,” Industrial and Engineering Chemistry Research, Vol. 37, No. 3, 1998, pp. 867-872.
 H. S. Joo and J. A. Guin, “Continuous Upgrading of a Plastics Pyrolysis Liquid to an Environmentally Favorable Gasoline Range Product,” Fuel Processing Technology, Vol. 57, No. 1, 1998, pp. 25-40.
 X. Xiao, W. Zmierczak and J. Shabtai, “Depolymerization-Liquefaction of Plastics and Rubbers. 1. Polyethylene, Polypropylene and Polybutadiene,” ACS Division of Fuel Chemistry, 1995, Vol. 40, No. 1, pp. 4-8.
 M. A. Uddin, K. Koizumi, K. Murata and Y. Sakata, “Thermal and Catalytic Degradation of Structurally Different Types of Polyethylene into Fuel Oil,” Polymer Degradation and Stability, Vol. 56, No. 1, 1997, pp. 37-44.
 W. Zhao, S. Hasegawa, J. Fujita, F. Yoshii, T. Sasaki, K. Makuuchi, J. Sun and S. Nishimoto, “Effects of Zeolites on the Pyrolysis of Polypropylene,” Polymer Degradation and Stability, Vol. 53, No. 1-2, 1996, pp. 129-135.
 P. T. Williams and E. A. Williams, “Fluidised Bed Pyrolysis of Low Density Polyethylene to Produce Petrochemical Feedstock,” Journal of Analytical and Applied Pyrolysis, Vol. 51, No. 1-2, 1999, pp. 107-126.
 Y. Uemichi, Y. Makino and T. Kanazuka, “Degradation of Polypropylene to Aromatic Hydrocarbons over Pt- and Fe-Containing Activated Carbon Catalysts,” Journal of Analytical and Applied Pyrolysis, Vol. 16, No. 3, 1989, pp. 229-238.