1. Standard test method for determination of carbon black content in polyethylene by the muffle furnace technique;ASTM,1990
2. Atlas of Infrared Spectra, Sadtler Research Laboratory, PA, USA.
3. Weathering of Polymers;Davis,1983
4. Duvall, D. E. Environmental degradation of PET and it's potential effect on long term mechanical properties of oriented PET products. Polym.-Plast. Technol. Eng., (submitted).
5. Polymer Degradation and Stabilization;Grassie,1985