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Translated from Matematicheskie Zametiki, Vol. 53, No. 6, pp. 145–148, June, 1993.
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Guseinov, R.G. Spectrum of quasielliptic differential operators. Math Notes 53, 661–663 (1993). https://doi.org/10.1007/BF01212606
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DOI: https://doi.org/10.1007/BF01212606