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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 37, No. 1, pp. 38–42, January–February, 1985.
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Mazko, A.G. An estimate of the location of the spectrum of a matrix relative to plane curves. Ukr Math J 37, 31–35 (1985). https://doi.org/10.1007/BF01056848
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DOI: https://doi.org/10.1007/BF01056848