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2. Vaughn, H. A.: Journal of Polymer Science, Part B7.569 (1969).
3. Greber, G.: J. praktische Chemie 313,461 (1971).
4. Noll, W.: Chemistry and technology of Silicones, Academic Press, New York (1968).
5. Meals, R.: Encyclopedia of Chemical technology, Volume 18, Second Edition, page 221 (1969).