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digraph; radius; diameter; graph; strong digraph

References:

[1] Buckley F., Harary F.: **Distance in Graph**. Reading (MA 1989). Addison-Wesley.

[2] Chartrand G., Lesniak L.: **Graphs and Digraphs**. (second edition). Wadsworth and Brooks/Cole, Monterey, CA. MR 0834583 | Zbl 1057.05001

[3] Chartrand G., Tian L.: **Distance in digraphs**. 15 p., Mathematics and Computer Models. Preprint. MR 1486881 | Zbl 0903.05018