1. Standard methods for the examination of water and wastewater;American Public Health Association,1965
2. Sewage oxidation ponds, performance, operation and design;Caldwell;Sewage Industr. Wastes,1946
3. Inhibitors produced by algae as an ecological factor affecting bacteria in water—II. Antibacterial activity of algae during blooms;Chrost;Acta Microbiologia Pol. Ser. B,1975
4. The efficiency of conventional sewage purification works, stabilization ponds and maturation ponds with respect to the survival of pathogenic bacteria and indicator organisms;Coetzee,1965
5. Oxidation ponds;Davis,1963