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Translated from Matematicheskie Zametki, 2021, Vol. 110, pp. 471–477 https://doi.org/10.4213/mzm13143.
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Malamud, M.M., Marchenko, V.V. Invariant Schrödinger Operators with Point Interactions at the Vertices of a Regular Polyhedron. Math Notes 110, 463–469 (2021). https://doi.org/10.1134/S0001434621090169
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DOI: https://doi.org/10.1134/S0001434621090169