Geodesic
On radially extremal digraphs
Mathematica Bohemica, Tome 120 (1995) no. 1, pp. 41-55.

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We define digraphs minimal, critical, and maximal by three types of radii. Some of these classes are completely characterized, while for the others it is shown that they are large in terms of induced subgraphs.
DOI : 10.21136/MB.1995.125895
Classification : 05C12, 05C20, 05C35
Keywords: digraphs; characterization; radius of a digraph; a digraph minimal (critical, maximal) by radius; induced subgraph 
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Gliviak, Ferdinand; Knor, Martin. On radially extremal digraphs. Mathematica Bohemica, Tome 120 (1995) no. 1, pp. 41-55. doi : 10.21136/MB.1995.125895. http://geodesic.mathdoc.fr/articles/10.21136/MB.1995.125895/

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