Josef Al Jumayel, Maretta Sarkis, Hasan Jafar. On Phi-Euler’s Function in Refined Neutrosophic Number Theory and The Solutions of Fermat’s Diophantine Equation. Neutrosophic Sets Syst. 2023;54:68-76. Accessed June 5, 2025. https://fs.unm.edu/nss8/index.php/111/article/view/3255