Literature Cited
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Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 15, No. 2, pp. 292–298, March–April, 1974.
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Derguzov, V.I. On the discreteness of the spectrum of non-self-adjoint periodic boundary-value problems. Sib Math J 15, 205–209 (1974). https://doi.org/10.1007/BF00968285
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DOI: https://doi.org/10.1007/BF00968285