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van Wijk-Sijbesma, C.A., Huizinga, B. & Hubley, J.H., 1988. International course on low-cost water supply and sanitation : socio-cultural subjects, Delft, The Netherlands: IHE (International Institute for Infrastructural, Hydraulic and Environmental Engineering). Available at: https://fr.ircwash.org/sites/default/files/205.1-88IN-7225.pdf.