Parlindungan, Markus Togi, Sariyasa Sariyasa, and Putu Kartika Dewi. “Indeks Randic Pada Graf Nilpoten Dari Gelanggang Bilangan Bulat Modulo: The Randić Index Of The Nilpotent Graph Of The Integers Modulo Ring”. Citizen : Jurnal Ilmiah Multidisiplin Indonesia 6, no. 1 (February 2, 2026): 67–82. Accessed May 4, 2026. https://journal.das-institute.com/index.php/citizen-journal/article/view/1191.