Purification Performance of Biological Two-staged Plant Sewage Systems. ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference, [S. l.], v. 1, p. 108–114, 2006. DOI: 10.17770/etr2003vol1.1992. Disponível em: https://archive-journals.rtu.lv/etr/article/view/3557.. Acesso em: 11 mar. 2026.