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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 39, No. 6, pp. 751–756, November–December, 1987.
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Spitkovskii, I.M., Tishin, P.M. Partial indices of triangular matrices of order higher than 2. Ukr Math J 39, 611–615 (1987). https://doi.org/10.1007/BF01062887
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DOI: https://doi.org/10.1007/BF01062887