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Twin signed total Roman domination numbers in digraphs

Asian-European Journal of Mathematics, 2018
Let [Formula: see text] be a finite simple digraph with vertex set [Formula: see text] and arc set [Formula: see text]. A twin signed total Roman dominating function (TSTRDF) on the digraph [Formula: see text] is a function [Formula: see text] satisfying the conditions that (i) [Formula: see text] and [Formula: see text] for each [Formula: see text ...
Amjadi, J., Soroudi, M.
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