Using Multivariate Gray Model to Predict CO2 Emissions and People Using Safely Managed Sanitation Services. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ), [S. l.], v. 54, n. 1, p. 159–167, 2024. DOI: 10.55562/jrucs.v54i1.587. Disponível em: https://jrucs.iq/index.php/JAUCS/article/view/587. Acesso em: 23 apr. 2026.