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Additional information
Odessa. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 31, No. 5, pp. 182–186, September–October, 1990.
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Pivovarchik, V.N. On the discrete spectrum of a boundary value problem. Sib Math J 31, 853–856 (1990). https://doi.org/10.1007/BF00974503
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DOI: https://doi.org/10.1007/BF00974503