Leite BJ, Zimmermann NEK, Ferreira VLD. Use of multivariate statistics to analyze physical-chemical factors in sludge from a water treatment plant in Rio Grande do Sul. CeN [Internet]. 2022 Jul. 14 [cited 2025 Jan. 4];43:e7. Available from: https://periodicos.ufsm.br/cienciaenatura/article/view/66990