1. 1) A.M. Gessler and W.H. Haslett (to Esso Research andEngineering Co.), U.S.3,037,954 (05-06-1962).
2. 2) W.K. Fisher (to Uniroyal, Inc.), U.S.3,758,643.
3. 3) A.Y. Coran and R. Pater, Rubber Chem. Technol., 53, 781 (1980).
4. 4) A.Y. Coran and R. Patel, Rubber Chem. Technol., 54, 91, 892 (1981).
5. 5) A.Y. Coran, R. Patel and D. Williams, Rubber Chem. Technol., 55, 116 (1982).