1. Hodgkin, J., D. Solomon, J. Macromol. Sci. A8, 635 (1974).
2. Solomon, D., British Patent BP 12 28538 (1969).
3. Motoyoshi, M., Jap. Plastic Age, Sep.–Oct. 33, (1975).
4. Solomon, D., J. Hodgkin, B. Loft, D. Hawthorne, J. Macromol. Sci. A8, 649 (1974).
5. Plast. Techn.22, 71 (1976).