1 paper
Houmem Belkhechine, Imed Boudabbous, Mohamed Baka Elayech
Given a (directed) graph G=(V,A), a subset X of V is an interval of G provided that for any a, b\in X and x\in V-X, (a,x)\in A if and only if (b,x)\in A and (x,a)\in A if and only…