Vilfred, K., and A. Suryakala. “(a,d)-Continuous Monotonic Subgraph Decomposition of K_n+1 and Integral Sum Graphs G_(0,n)”. Tamkang Journal of Mathematics, vol. 46, no. 1, Mar. 2015, pp. 31-49, doi:10.5556/j.tkjm.46.2015.1432.