Harinarayanan, C. V. R., C. Y. Ponnappan, S. P. Subbiah, R. Sundareswaran, and V. Swaminathan. “Just Excellence and Very Excellence in Graphs With Respect to Strong Domination”. Tamkang Journal of Mathematics, vol. 38, no. 2, June 2007, pp. 167-75, doi:10.5556/j.tkjm.38.2007.87.