1. I. Savel’ev, Fundamentals of Theoretical Physics. Quantum Mechanics (Mir Publishers, 1982)
2. L. Landau, E. Lifshitz, Mechanics, vol. 1 (Elsevier, Amsterdam, 2013)
3. L. Landau, E. Lifshitz, Quantum Mechanics: Non-Relativistic Theory, vol. 3 (Elsevier, Amsterdam, 2013)
4. C.M. Bender, S.A. Orszag, Advanced Mathematical Methods for Scientists and Engineers I: Asymptotic Methods and Perturbation Theory, vol. 1 (Springer, Berlin, 1999)
5. D.J. Griffiths, D.F. Schroeter, Introduction to Quantum Echanics (Cambridge University Press, Cambridge, 2018)