1. Yu. I. Dytnerskii, Membrane Processes for Separation of Liquid Mixtures (Nauka, Moscow, 1975) [in Russian].
2. S. A. Reitlinger, Permeability of Polymer Materials (Khimiya, Moscow, 1974) [in Russian].
3. Encyclopedia of Polymers, Ed. by V. A. Kabanov, M. S. Akutin, N. F. Bakeev, et al. (Sovetskaya Entsiklopediya, Moscow, 1977), Vol. 3 [in Russian].
4. N. S. Orlov and S. M. Shebanov, in Proceedings of II All-Union Conference on Membrane Separation Methods (Vladimir, 1977), p. 133 [in Russian].