1. Pinner, S. H., Nature, 183, 1108 (1959).
2. Chapiro, A., Indust. des Plastique Modernes, 8, No. 1, 41 (1957); J. Chim. Phys., 53, 895 (1956).
3. Alexander, P., and Charlesby, A., J. Polymer Sci., 23, 355 (1957).
4. Malm, C. J., et al., Indust. Eng. Chem., 43, 684 (1951).
5. Pinner, S. H., and Wycherley, V., paper submitted to Wiesbaden Conference on High Polymers.