7BakerDL, Duke W F. Intermittent slow sand filters for house hold use-a field study in Haiti[A]. 4th International Slow Sand and Alternative Biological Filtration Conference[C]. London: IWA, 2006.
8ParkerM, Williams A, Youngblood C, et al. Water Sto2 ries: Expanding Opportunities in Small2scale Water and Sanitation Projeets[M]. Washington, DC: ECSP, 2006.