Shahzamanian, M.H., and B. Davvaz. “Roughness in Fuzzy Cayley Graphs”. Bulletin of the Karaganda University. Mathematics Series 112, no. 4 (December 29, 2023): 105–118. Accessed October 14, 2025. https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/609.