1. Wilson, J. E., Ind. Eng. Chem., 44, 1095 (1952).
2. Bair, H. E., Polym. Eng. Sci., 13, 435 (1973).
3. Howard, J. B., Proceedings of the 21st International Wire and Cable Symposium, 329 (1972).
4. Bernstein, B. S., Lee, P.N., Proceedings of the 24th International Wire and Cable Symposium, 202 (1975).
5. Kokta, E. T., ibid, 220.