1. A. M. Rosen, Theory of Isotope Separation in Columns (Atomizdat, Moscow, 1960) [in Russian].
2. Isotopes: Properties, Production, Application, Ed. by V. Yu. Baranov (IzdAT, Moscow, 2000) [in Russian].
3. S. E. Bresler, Radioactive Elements (Gos. Izd. Tekhn.-Teor. Liter., Moscow, 1957) [in Russian].
4. G. G. Devyatykh and Yu. B. Elliev, Introduction to the Theory of Fine Purification of Compounds (Nauka, Moscow, 1981) [in Russian].
5. P. G. Kuznetsov, V. A. Sokolov, and I. K. Sedin, in Division and Analysis of Hydrocarbon Gases (Akad. Nauk SSSR, Moscow, 1963), p. 114 [in Russian].