The rupture degree and gear graphs.
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Kirlangic, Alpay (2009)
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In response to [3] and [4] we prove that the recognition of cover graphs of finite posets is an NP-hard problem.
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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.
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