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Leningrad. Translated fromSibirskii Matematicheskii Zhurnal, Vol. 32, No. 2, pp. 74–87, March–April, 1991.
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Kozlov, V.A. On the spectrum of the pencil generated by the Dirichlet problem for an elliptic equation in an angle. Sib Math J 32, 238–251 (1991). https://doi.org/10.1007/BF00972770
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DOI: https://doi.org/10.1007/BF00972770