Sivagnanam Mutharasu, and M. Ramya. “Distance−\(k\) Unique Isolate Perfect Domination on Graphs”. Malaya Journal of Matematik 8, no. 04 (October 1, 2020): 2369–2373. Accessed November 21, 2024. https://www.malayajournal.org/index.php/mjm/article/view/1921.