Putra, L.R.W., Albaracin, J.R. and Wardhana, I.G.A.W. 2025. On Sombor Energy of the Nilpotent Graph of the Ring of Integers Modulo ε. Journal of the Indonesian Mathematical Society. 31, 3 (Aug. 2025), 1856. DOI:https://doi.org/10.22342/jims.v31i3.1856.