Geodesic
Which directed graphs have a solution?
Mathematica slovaca, Tome 27 (1977) no. 1, pp. 37-42.

Voir la notice de l'article provenant de la source Czech Digital Mathematics Library

Classification : 05C20 
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     title = {Which directed graphs have a solution?},
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Behzad, Mehdi; Harary, Frank. Which directed graphs have a solution?. Mathematica slovaca, Tome 27 (1977) no. 1, pp. 37-42. http://geodesic.mathdoc.fr/item/MASLO_1977__27_1_a4/