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Additional information
Institute of Applied Physics, Moldavian SSR Academy of Sciences. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 74, No. 3, pp. 331–344, March, 1988.
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Shondin, Y.G. Quantum-mechanical models in Rn associated with extensions of the energy operator in a Pontryagin space. Theor Math Phys 74, 220–230 (1988). https://doi.org/10.1007/BF01016615
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DOI: https://doi.org/10.1007/BF01016615