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Additional information
Leningrad State University, Leningrad. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 21, No. 5, pp. 27–38, September–October, 1980.
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Derguzov, V.I. Discreteness of the spectrum of a periodic boundary-value problem related to the radiation of periodic waveguides. Sib Math J 21, 664–672 (1980). https://doi.org/10.1007/BF00973880
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DOI: https://doi.org/10.1007/BF00973880