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Artículo
Triangle-Free Planar Graphs as Segments Intersection Graphs
(1999)
We prove that every triangle-free planar graph is the graph of intersection of a set of segments in the plane. Moreover, the segments can be chosen in only three directions (horizontal, vertical and oblique) and in such a ...
Artículo
On a visibility representation of graphs
(1996)
We give a visibility representation of graphs which extends some very well-known representations considered extensively in the literature. Concretely, the vertices are represented by a collection of parallel hyper-rectangles ...