1. Keller, A., Phil. Mag. 2, 1171 (1957).
2. Flory, P.J., J. Am. Chem. Soc. 84, 2857 (1962).
3. Treloar, L.R.G., ‘The Physics of Rubber Elasticity’, 3rd ed., Clarendon Press, Oxford (1975).
4. Frank, F.C., Far. Disc. Chem. Soc. 68, 7 (1979).
5. Flory, P.J., Yoon, D.J. and Dill, K.A., Hacromol. 17, 862 (1984).