S. Durai Raj, S. G. Shiji Kumari, and A. M. Anto. “Certified Domination Number in Corona Product of Graphs”. Malaya Journal of Matematik, vol. 9, no. 01, Jan. 2021, pp. 1080-2, https://www.malayajournal.org/index.php/mjm/article/view/1223.