1. V. S. SHMIDT. Extraction by Amines, Atomizdat, Moscow, 1970.
2. YU. G. FROLOV, A. V. OCHKIN, V. V. SERGIEVSKII, Some Theoretical Problems of Extraction by Amines, MKhTI im. Mendeleeva, Moscow, 1969.
3. A. A. KOPYRIN, M. Phil. Thesis, Leningrad, 1971.
4. V. P. SHVEDOV, A. A. KOPYRIN, V. S. TITOV, J. Radioanal. Chem., 12 (1972) 421.
5. G. BECKER, Introduction in the Electronic Theory of Organic Reactions, Mir, Moscow, 1965.