Even Harmonious Graphs
Joseph A. Gallian, Lori Ann Schoenhard, S. Arumugam · AKCE International Journal of Graphs and Combinatorics · 2013
A graph G with q edges is said to be harmonious if there is an injection f from the vertices of G to the group of integers modulo q such that when each edge xy is assigned the label f(x) + f(y) (mo...