1. L.D. Landau, E.M. Lifshitz: Mechanics (Pergamon, Oxford 1969)
2. L.D. Landau, E.M. Lifshitz: Quantum Mechanics (Pergamon, Oxford 1977)
3. H.A. Bethe, E.E. Salpeter: Quantum Mechanics of One- and Two- Electron atoms (Springer-Verlag, New York 1957)
4. H. Bateman, A. Erdelyi: Higher Transcendental Functions (McGraw-Hill, New York, Toronto, London 1953);
5. I.S. Gradshteyn, I.W. Ryzhik: Tables of Integrals, Series and Products (Academic, New York 1965);