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3. V. B. Belyaev, Lectures on the Theory of Few-Body Systems (Énergoatomizdat, Moscow, 1986).
4. L. D. Faddeev, Mathematical Aspects of the Three-Body Problem in Quantum Scattering Theory (Davey, New York, 1965).
5. S. P. Merkur’ev and L. D. Faddeev, Quantum Mechanics of Three-Body Systems (Nauka, Moscow, 1987).