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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 41, No. 10, pp. 1391–1395, October, 1989.
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Kochubei, A.N. One-dimensional point interactions. Ukr Math J 41, 1198–1201 (1989). https://doi.org/10.1007/BF01057262
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DOI: https://doi.org/10.1007/BF01057262