1. Boyd, Adamson, and Meyers, Chromatographic Method for Separation of Ions [Russian translation], IL (1949), p. 333.
2. F. Helferik, Ionites. Principles of Ion Exchange [Russian translation], IL (1962).
3. G. A. Aksel'rud, Zhur. Fizich. Khimii,37, 1251 (1963).
4. G. A. Aksel'rud, Theory of Diffusion Extraction of Substances from Porous Substances [in Russian], Izd. Politekhnicheskogo Institute, L'vov (1959).
5. I. N. Fiklistov and G. A. Aksel'rud, Inst. Fiz. Zhur.,10, No. 4, 531 (1966).