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Kiev. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 32, No. 3, pp. 60–69, May–June, 1991.
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Kochubei, A.N. Self-adjoint extensions of a Schrödinger opertor with singular potential. Sib Math J 32, 401–409 (1991). https://doi.org/10.1007/BF00970475
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DOI: https://doi.org/10.1007/BF00970475