Mathematical Formulation of River Quality Index Based on Awareness of River Pollution. Contemporary Mathematics , [S. l.], v. 6, n. 5, p. 6333–6345, 2025. DOI: 10.37256/cm.6520256390. Disponível em: https://ojs353.mebyme.cn/index.php/CM/article/view/6390. Acesso em: 24 dec. 2025.