Ghazali, Puspa Liza, Siti Nadhirah Mohamad Fauzi, Aze Fauziah Suib, Farah Amalina Md Nawi, Sharifah Arni Syed Jaaffar, Eni Noreni Mohamad Zain, Hamidah Che Abdul Hamid, Hafizan Juahir, and Sukono. “Mathematical Formulation of River Quality Index Based on Awareness of River Pollution”. Contemporary Mathematics 6, no. 5 (September 16, 2025): 6333–6345. Accessed January 10, 2026. https://ojs.wiserpub.com/index.php/CM/article/view/6390.