L(2,1)-labelings of some famillies of oriented planar graphs
Sagnik Sen · Discussiones Mathematicae Graph Theory · 2013
In this paper we determine, or give lower and upper bounds on, the 2-dipath and oriented L(2, 1)-span of the family of planar graphs, planar graphs with girth 5, 11, 16, partial k-trees, outerplanar graphs and cacti.