Fig. 9From: Further results on edge even graceful labeling of the join of two graphsAn edge even graceful labeling of the double cones \( \overline {K}_{2} + ~C_{7} \), \( \overline {K}_{2} + ~C_{9} \), \( \overline {K}_{2} + ~C_{11} \), and \( \overline {K}_{2} + ~C_{12}\)Back to article page