1. B. Ranby and J. F. Rabek, ?Photodegradation, Photo-oxidation and Photostabilisation of Polymers? (Interscience Publishers, N.Y., 1975).
2. A. King, Plastics and Polymers (June 1968).
3. N. S. Allen and J. F. McKellar, Chem. Soc. Revs. 4 (1975) 533.
4. W. L. Dills and T. B. Reeve, Plast. Technol., 16 (1970) 650.
5. G. R. Hill and R. J. Martinovich, Paper Presented at the Technical Regional Conference, Society of Plastics Engineers, Philadelphia Sect., Pa., Oct. 2?3 (1972).