SARI, Elviana; WIDYASARI, Rina. Application of Hotelling T2 Control Diagram to Analyze Drinking Water Quality Control at Perumda Tirtauli Pematang Siantar City. Mathline : Jurnal Matematika dan Pendidikan Matematika, [S. l.], v. 9, n. 1, p. 273–284, 2024. DOI: 10.31943/mathline.v9i1.578. Disponível em: https://mathline.unwir.ac.id/index.php/Mathline/article/view/578. Acesso em: 24 dec. 2025.