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Plummer, J. & Nhemachena, G., 2001. Preparing a concession : working towards private sector participation in water and sanitation services in Gweru, Zimbabwe, (Building municipal capacity for private sector participation series : working papers / GHK no, 442 04) London, UK: GHK Research and Training. Available at: https://es.ircwash.org/sites/default/files/Plummer-2001-Preparing.pdf.