1. O. Bayer, Angew. Chem. 59, (9), 257 (1947).
2. 2.O. Bayer, E. Müller, S. Petersen, H-F. Piepenbrink and E. Windemuth, Rubber Chem. Technol. 23, (4) 812, (1950).
3. C. S. Schollenberger, H. Scott, G. R. Moore: (a) Rubber World 137 (4), 549 (Jan. 1958);
4. C. S. Schollenberger, H. Scott, G. R. Moore: (b) Rubber Chem. Technol. 35 (3), 742, (1962).
5. C. S. Schollenberger (assignor to the B. F. Goodrich Co.), U.S. Pat. 2,871,218 (Jan. 27, 1959).