Two bounds of chromatic number in graphs coloring problem. - Assia Gueham; Anass Nagih; Hacène Aït Haddadène (CoDIT, 2014)

Graph coloring approach with new upper bounds for the chromatic number: team building application. - Assia Gueham; Anass Nagih; Hacène Aït Haddadène; Malek Masmoudi (RAIRO Oper. Res., 2018)

Contraction-based method for computing a lower bound on the clique number of a graph. - Assia Gueham; Hacène Aït Haddadène; Anass Nagih (CoDIT, 2019)