1. A. Sippel, Koll.-Z.,127, 79 (1952).
2. A. Sippel, Kunststoffe,49, 626 (1959).
3. S. N. Zhurkov and S. A. Abasov, Fiz. Tverd. Tela,4, No. 8, 2184 (1962).
4. N. V. Mikhailov, V. O. Gorbacheva, E. V. Khait, Yu. N. Kochanyuk, and N. S. Khokhlova, Khim. Volokna, No. 4, 26 (1963).
5. S. R. Rafikov, S. A. Pavlova, and I. I. Tverdokhlebova, Methods of Determining the Molecular Weights and Polydispersity of High-Molecular Compounds [in Russian], Izd. AN SSSR (1959), p. 327.