1. E. Leitz Inc, General Catalogue, Rockleigh, N.J.
2. Tanaka, H., Masuko, T. and Okajima, S. (1972). J. Appl. Polvm. Sci., 16, 441.
3. Stein, R. S. and Clough, S. (1963). ONR Tech. Rept. No. 67. Project NR 356–378, Contract No. 3357(01), Univ. Mass.
4. Erhardt, P. and Stein, R. S. (1967). Appl. Polym. Symp. 5 (Ed. R. D. Andrews, Jr. and F. R. Eirich), Interscience, New York, Vol. 1, p. 113.
5. Wilkes, G. L. and Stein, R. S. (1969), J. Polymer Sci. A-2, 7, 1525.