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2. Clark, H.: A First Course in Quantum Mechanics. Van Nostrand Reinhold (UK) Co. Ltd., Wokingham (1982)
3. de Broglie, L.: Recherches sur la theorie des quanta. Ph.D. Thesis, Sorbonne University of Paris, France (1924)
4. Dirac, P.A.M.: Lectures on Quantum Mechanics. Courier Dover Publications, New York (1964)
5. Dirac, P.A.M.: Principles of Quantum Mechanics. Clarendon Press, Oxford (1981)