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Kariuki, M. & Schwartz, J., 2005. Small-scale private service providers of water supply and electricity : a review of incidence, structure, pricing, and operating characteristics, (Policy research working paper series / World Bank 3727) Washington, DC, USA: World Bank. Available at: https://es.ircwash.org/sites/default/files/Kariuki-2005-Smallscale.pdf.