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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 10, No. 3, May–June, pp. 600–613, 1969
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Lyubich, Y.I., Tabachnikov, M.I. Subharmonic functions on a directed graph. Sib Math J 10, 432–442 (1969). https://doi.org/10.1007/BF01078333
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DOI: https://doi.org/10.1007/BF01078333