1. M. I. Bessonov and E. V. Kuvshinskii, Soviet Phys. Solid. St. 3 (1962) 1947.
2. O. K. Spurr and W. D. Niegisch, J. Appl. Polym. Sci. 6 (1962) 585.
3. R. P. Kambour, ?Applied Polymer Symposia No. 7: Polymer Modification of Rubbers and Plastics? (Interscience, New York 1968) p. 215.
4. A. VanDen Boogart, ?Physical Basis of Yield and Fracture? (The Institute of Physics and The Physical Society, 1966) p. 167.
5. J. Murray and D. Hull, Polymer 10 (1969) 451.