1. J.A. Manson and R.W. Hertzberg,Critical Reviews in Macromolecular Science 1 (1973) 433.
2. S. Rabinowitz and P. Beardmore,Critical Reviews in Macromolecular Science 1 (1972) 1.
3. R.P. Kambour,Macromolecular Reviews 7 (1973) 1.
4. W.J. Plumridge,Journal of Materials Science 7 (1972) 939.
5. E.H. Andrews, Chapter 7 inThe Physics of Glassy Polymers, Editor, R.N. Haward, Applied Science Publishers Ltd., London (1973).