Some results on cubic harmonious labeling

A (n, m) graph G =(V, E) is said to be Cubic Harmonious Graph(CHG) if there exists an injective function f: V(G)→{1, 2, 3, ………m³+1} such that the induced mapping f *chg: E(G)→ {13, 23, 33, ……….m³} defined by f *_chg(uv) = (f(u)+f(v)) mod (m³+1) is a bijection. Here we will discuss about cubic harmonious labeling techniques of the graph P_n O K₁-e and twig graph.