Biblio

L. J. M., Wegelin, M., y G. C., G., «La filtracion gruesa en el tratamiento de agua de fuentes superficiales», vol. no. 4/98. SKAT (Swiss Centre for Development Cooperation in Technology and Management), St. Gallen, Switzerland, p. vi, 170 p. : fig., photogr., tab., 1998.

M. Pardon, Wegelin, M., y G. C., G., «Prefilters, handpumps and small tanks : key issues for viable rural water supplies?», Water supply : the review journal of the International Water Supply Association, pp. p. SS18.1-SS18.8: fig., tab., 1989.