H Roslan, AS Ameen, YH Peng, HX Zhao - Journal of Applied …, 2011 - Springer
Let P (G, λ) be the chromatic polynomial of a graph G. Two graphs G and H are said to be
chromatically equivalent, denoted G∼ H, if P (G, λ)= P (H, λ). We write [G]={H∣ H∼ G}. If …