1. National Primary Drinking Water Regulations: Synthetic Organic Chemicals, Inorganic Chemicals, and Microorganisms;USEPA;Fed. Reg.,1985
2. Modeling the Risk From Giardia and Viruses in Drinking Water;Regli;Jour. AWWA,1991
3. Land Application of Wastewater: The Fate of Viruses, Bacteria, and Heavy Metals at a Rapid Infiltration Site;Schaub,1975