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]
@article{HasunumaIOU12-0,
title = {A tight upper bound on the (2, 1)-total labeling number of outerplanar graphs},
author = {Toru Hasunuma and Toshimasa Ishii and Hirotaka Ono and Yushi Uno},
year = {2012},
doi = {10.1016/j.jda.2011.12.020},
url = {http://dx.doi.org/10.1016/j.jda.2011.12.020},
researchr = {https://researchr.org/publication/HasunumaIOU12-0},
cites = {0},
citedby = {0},
journal = {J. Discrete Algorithms},
volume = {14},
pages = {189-206},
}