Geodesic
The Existence of Planar Hypotraceable Oriented Graphs
Discrete mathematics & theoretical computer science, Tome 19 (2017-2018) no. 1.

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A digraph is \emph{traceable} if it has a path that visits every vertex. A digraph $D$ is \emph{hypotraceable} if $D$ is not traceable but $D-v$ is traceable for every vertex $v\in V(D)$. It is known that there exists a planar hypotraceable digraph of order $n$ for every $n\geq 7$, but no examples of planar hypotraceable oriented graphs (digraphs without 2-cycles) have yet appeared in the literature. We show that there exists a planar hypotraceable oriented graph of order $n$ for every even $n \geq 10$, with the possible exception of $n = 14$. 
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     author = {van Aardt, Susan and Burger, Alewyn Petrus and Frick, Marietjie},
     title = {The {Existence} of {Planar} {Hypotraceable} {Oriented} {Graphs}},
     journal = {Discrete mathematics & theoretical computer science},
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van Aardt, Susan; Burger, Alewyn Petrus; Frick, Marietjie. The Existence of Planar Hypotraceable Oriented Graphs. Discrete mathematics & theoretical computer science, Tome 19 (2017-2018) no. 1. doi : 10.23638/DMTCS-19-1-4. http://geodesic.mathdoc.fr/articles/10.23638/DMTCS-19-1-4/

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