1. Klason, C. Polymer Recycling, 1995, 4, 212.
2. Food and Drug Administration, Points to consider for the use of recycled plastics: food packaging, chemistry considerations. Div. Food Chem. Technol., HP400, Washington, 1992.
3. Nielssen, T. J. J. Food Sci., 1994, 59, 227.
4. Vadel, A. Bios, 1994, 245, 37.
5. Commission of the European Communities, Draft synoptic document on plastics materials and articles intended to come in contact with foodstuffs. CS/PM 2356, Brussels, 1994.