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D. C. Moran, Moran, M. C., Cushing, R. S., and Lawler, D. F., Particle behavior in deep-bed filtration. Part 2 : Particle detachment, Journal American Water Works Association, pp. p. 82-93: 8 fig., 2 tab., 1993.
D. Fogel, Isaac-Renton, J., Guasparini, R., Moorehead, W., and Ongerth, J., Removing Giardia and Cryptosporidium by slow sand filtration, Journal American Water Works Association, pp. p. 77-84: 7 tab., photogr., 1993.
M. Strauss and Cross, P., Health aspects of nightsoil and sludge use in agriculture and aquaculture. Part I : Existing practices and beliefs in the utilization of human excreta ; Part II : Pathogen survival, vol. no. 04/85. International Reference Centre for Waste Disposal, Duebendorf, Switzerland, p. ca. 150 p.: fig., tab., 1986.
P. R. Mason, Patterson, B. A., and Loewenson, R., Piped water supply and intestinal parasitism in Zimbabwean schoolchildren., Transactions of the Royal Society of Tropical Medicine and Hygiene, pp. p. 88-93: fig., tab., 1986.
James M. Montgomery Consulting Engineers -Pasadena, CA, US, Water treatment principles and design. New York, NY, USA: Wiley, 1985, p. xii, 696 p.: fig., tab.