M.P., Kulandai Vel, Selvaraju P., and Sivagnanam C. “Neighborhood Connected Perfect Domination in Graphs”. Tamkang Journal of Mathematics 43, no. 4 (December 31, 2012): 557–562. Accessed April 29, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/839.