Goldfeder, IA; Urrutia, I; Galeana-Sánchez, H
(2010)
In this paper, D = (V (D), A(D)) denotes a loopless directed graph (digraph) with at most one arc from u to v for every pair of vertices u and v of V (D). Given a digraph D, we say that D is 3-quasi-transitive if, whenever ...