S. Akila Devi, R. Sophia Porchelvi, and T. Arjun. “Pronic Heron Mean Labeling on Special Cases of Generalized Peterson Graph P(n;K) and Disconnected Graphs”. Malaya Journal of Matematik, vol. 9, no. 01, Jan. 2021, pp. 262-6, https://www.malayajournal.org/index.php/mjm/article/view/1012.