1. Schroeter, R.: Ph. D. Thesis Halle (1923).
2. Beyte, W.: Ph. D. Thesis Halle (1924).
3. Kosanke, V.: Ph. D. Thesis Halle (1924).
4. Angeloni, A.S., Laus, M., Castellari, C., Galli, G., Ferruti, P., Chiellini, E.: Makromol Chem. 186,977 (1985).
5. Ebeling, G.: Ph. D. Thesis Halle (1924).