A tight upper bound on the (2, 1)-total labeling number of outerplanar graphs

Toru Hasunuma, Toshimasa Ishii, Hirotaka Ono, Yushi Uno. A tight upper bound on the (2, 1)-total labeling number of outerplanar graphs. J. Discrete Algorithms, 14:189-206, 2012. [doi]

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