1. L. D. Landau and E. M. Lifshitz, Course of Theoretical Physics, Vol. 3: Quantum Mechanics: Non-Relativistic Theory, 4th ed. (Nauka, Moscow, 1989; Pergamon, New York, 1977).
2. I. G. Kaplan, Symmetry of Many-Electron Systems (Nauka, Moscow, 1969; Academic Press, New York, 1975).
3. P. Bunker, Molecular Symmetry and Spectroscopy (Academic, New York, 1979; Mir, Moscow, 1981).
4. J. P. Elliott and P. G. Dawber, Symmetry in Physics (Macmillan, London, 1979; Mir, Moscow, 1983), Vol. 2.
5. P. R. Bunker and P. Jensen, Molecular Symmetry and Spectroscopy (NRC Research Press, Ottawa, 1988; Mir, Moscow, 2004).