Husni, Muhammad Naoval, et al. “Szeged Index and Padmakar-Ivan Index of Nilpotent Graph of Integer Modulo Ring With Prime Power Order ”. Jurnal Matematika, Statistika Dan Komputasi, vol. 20, no. 2, Dec. 2023, pp. 332-9, doi:10.20956/j.v20i2.31418.