Geodesic
Radial Digraphs
Kragujevac Journal of Mathematics, Tome 34 (2010), p. 161

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The Radial graph of a graph $G$, denoted by $R(G)$, has the same vertex set as $G$ with an edge joining vertices $u$ and $v$ if $d(u, v)$ is equal to the radius of $G$. This definition is extended to a digraph $D$ where the arc $(u, v)$ is included in $R(D)$ if $d(u, v)$ is the radius of $D$. A digraph $D$ is called a Radial digraph if $R(H)=D$ for some digraph $H$. In this paper, we shown that if $D$ is a radial digraph of type 2 then $D$ is the radial digraph of itself or the radial digraph of its complement. This generalizes a known characterization for radial graphs and provides an improved proof. Also, we characterize self complementary self radial digraphs.
Classification : 05C12 05C20
Keywords: Radial graphs, Radial digraphs, Self-radial graphs, Self-radial digraphs 
Kumarappan Kathiresan; R. Sumathi. Radial Digraphs. Kragujevac Journal of Mathematics, Tome 34 (2010), p. 161 . http://geodesic.mathdoc.fr/item/KJM_2010_34_a14/
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     author = {Kumarappan Kathiresan and R. Sumathi},
     title = {Radial {Digraphs}},
     journal = {Kragujevac Journal of Mathematics},
     pages = {161 },
     year = {2010},
     volume = {34},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KJM_2010_34_a14/}
}
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