Razak, Tajul Rosli, Shukor Sanim Mohd Fauzi, Ray Adderley JM Gining, Mohammad Hafiz Ismail, and Ruhaila Maskat. “Hierarchical Fuzzy Systems: Interpretability and Complexity”. Indonesian Journal of Electrical Engineering and Informatics (IJEEI) 9, no. 2 (June 15, 2021): 478–489. Accessed November 3, 2026. https://section.iaesonline.com/index.php/IJEEI/article/view/2813.