Verifying and Weighting Factors using Fuzzy Delphi Method Approach in The Construction of Public Perception Index (PPI) on River Quality. Contemporary Mathematics , [S. l.], v. 6, n. 4, p. 3862–3872, 2025. DOI: 10.37256/cm.6420255842. Disponível em: https://ojs353.mebyme.cn/index.php/CM/article/view/5842. Acesso em: 24 dec. 2025.