1. N. A. Kolokol'tsov and N. I. Laguntsov, At. Energ.,27, 560 (1969).
2. N. A. Kolokol'tsov and N. I. Laguntsov,ibid.,29, 300 (1970).
3. K. Cohen, The Theory of Isotope Separation, New York (1951).
4. A. M. Rozen, Theory of Isotope Separation in Columns [in Russian], Atomizdat, Moscow (1960).
5. W. Buland et al., Z. Phys. Chem.,214, 249 (1960).