1. J. Y. Cavaille, C. Jourdan, J. Perez, L. Monnerie andG. P. Johari,J. Polym. Sci., Polym. Phys. Edn 25 (1987) 1235.
2. A. S. Nowick andB. S. Berry, “Anelastic Relaxation in Crystalline Solids” (Pergamon, New York, 1972).
3. C. Zener, “Elasticity and Anelasticity of Metals” (University of Chicago Press, Chicago, 1948).
4. J. D. Ferry, “Viscoelastic Properties of Polymers” (Wiley, New York, 1980).
5. F. Povolo, to be published.