Vaidya, S. K., and H. D. Vadhel. “On Congruent Domination Number of Disjoint and One Point Union of Graphs”. Journal of the Indonesian Mathematical Society 28, no. 3 (November 30, 2022): 251–258. Accessed December 3, 2024. https://jims-a.org/index.php/jimsa/article/view/1102.