1. Grot, W.: Chem.-Ing.-Tech. 44 (1972) p. 167.
2. Grot, W.: Chem.-Ing.-Tech. 47 (1975) p. 617.
3. Yeo, S. C.; Eisenberg, A.: J. Appl. Polymer Sci. 21 (1977) pp. 875/898.
4. E. I. duPont de Nemours & Co. (Inv. Walter G. Grot), USP 4 021 327 (May 3, 1977).
5. Diamond Shamrock Corporation (Inv. Ronald L. Dotson), USP 3 793 163 (Febr. 19, 1974).