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Translated from Matematicheskie Zametki, Vol. 50, No. 2, pp. 155–157, August, 1991.
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Pokornyi, Y.V., Karelina, I.G. Nonlinear comparison theorems on graphs. Mathematical Notes of the Academy of Sciences of the USSR 50, 879–880 (1991). https://doi.org/10.1007/BF01157581
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DOI: https://doi.org/10.1007/BF01157581