1. Covering of slow sand filtration; qualitative and operational aspects;Abrahamsson,2006
2. Development of a Microfiltration and Ultrafiltration Knowledge Base;Adham,2005
3. ASCE (1991). Slow Sand Filtration (Ed. Logsdon, G. S.). New York.
4. ASTM (2005). Standard Test Method for Ball Pan Hardness. D3802.
5. Manual of Practice M53: Microfiltration and Ultrafiltration Membranes for Drinking Water;AWWA,2005