Gravitational Search Algorithm Optimization for PID Controller Tuning in Waste-water Treatment Process. Jurnal Teknologi, [S. l.], v. 73, n. 3, 2015. DOI: 10.11113/jt.v73.4254. Disponível em: https://journals.utm.my/jurnalteknologi/article/view/4254.. Acesso em: 7 jul. 2024.