Josef Al Jumayel, Maretta Sarkis, and Hasan Jafar, “On Phi-Euler’s Function in Refined Neutrosophic Number Theory and The Solutions of Fermat’s Diophantine Equation”, Neutrosophic Sets Syst., vol. 54, pp. 68–76, Mar. 2023, Accessed: Jun. 03, 2025. [Online]. Available: https://fs.unm.edu/nss8/index.php/111/article/view/3255