The crossing number of the generalized Petersen graph is four
Marko Lovrečič Saražin (1997)
Mathematica Slovaca
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Marko Lovrečič Saražin (1997)
Mathematica Slovaca
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Pavol Híc (1984)
Mathematica Slovaca
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R. Vasuki, A. Nagarajan (2012)
Kragujevac Journal of Mathematics
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Sagnik Sen (2014)
Discussiones Mathematicae Graph Theory
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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.