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Pfammatter, R. y Schertenleib, R., «Non-governmental refuse collection in low-income urban areas : lessons learned from selected schemes in Asia, Africa and Latin America», vol. no. 1/96. Water and Sanitation in Developing Countries (SANDEC), Duebendorf, Switzerland, p. iv, 70 p.: 11 fig., 10 photogr., 2 tab., 1996.