V. Lukitosari, S. Sunarsini, W. F. Doctorina, L. P. Wardhani, and E. R. M. Putri, “Monitoring water quality using control charts at PDAM Surya Sembada Surabaya”, ABDIMAS J. Pengabdi. Masy. Univ. Merdeka Malang, vol. 8, no. 1, pp. 13–24, Mar. 2023.