Assessment of up-flow and down-flow dual media filters for secondary treated wastewater. Indian Journal of Engineering and Materials Sciences (IJEMS), [S. l.], v. 31, n. 3, p. 351–357, 2024. DOI: 10.56042/ijems.v31i3.6369. Disponível em: https://or.niscpr.res.in/index.php/IJEMS/article/view/6369. Acesso em: 13 may. 2026.