1. Guth, E. and Mark, H. Monatshefte, 65, 93 (1934).
2. Flory, P.J. and Rehner, J. J. Chem. Phys., 11, 521 (1943).
3. James, H.M. and Guth, E. J. Chem. Phys., 15, 651 (1947).
4. Flory, P.J. Principles of Polymer Chemistry; Cornell University. Press, Ithaca, NY, 1953.
5. Frenkel, J. Rubber Chem. Technol., 13, 264 (1940).