1. Bohm, A. (1986). Quantum Mechanics: Foundations and Applications, Springer-Verlag, New York.
2. Dodonov, V. V. and Man'ko, V. I. (1987). Trudy FIAN, 183, 1–70. Nauka, Moscow (in Russian).
3. Fano, G. (1971). Mathematical Methods of Quantum Mechanics, McGraw-Hill, New York.
4. Gantmakher, F. R. (1960). The Theory of Matrices, Chelsea, New York.
5. Messiah, A. (1961). Quantum Mechanics, North Holland, Amsterdam.