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3. H. Kleinert, Path Integrals in Quantum Mechanics, Statistics, Polymer Physics, and Financial Markets (World Scientific, Singapore, 2009)
4. A.L. Fetter, J.D. Walecka, Quantum Theory of Many-Particle Systems (McGraw-Hill Book Company, New York, 1971)
5. P.M. Morse, H. Feshbach, Methods of Theoretical Physics, Part 1 (McGraw-Hill Book Company, New York, 1953)