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It has been known for years that the problem of computing the T-span is NP-hard in general. Recently, Giaro et al. (Discrete Appl. Math., to appear) showed that the problem remains NP-hard even for graphs of degree Δ=<3 and it is polynomially solvable for graphs with degree Δ=<2. Herein, we extend the latter result. We introduce a new class of graphs which is large enough to contain paths, cycles,...
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