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2. A. L. BARNEY (1978), private communication
3. M. BRUZZONE and G. CRESPI, Chim. Ind. (Milan), 42, 1226 (1960)
4. M. M. COLEMAN, D. L. TABB, and E. G. BRAME, Jr., Rubber Chem. Tech., 50, 49 (1971)
5. M. M. COLEMAN and E. G. BRAME, Jr., Rubber Chem. Tech., 51, 668 (1978)