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.

J. T. Visscher, J. M., L., G. C., G., y Ochoa, A. E., «Comparison of horizontal and upflow roughing filtration», in Advances in slow sand and alternative biological filtration, 1996, pp. P. 341-348 : 2 fig., 6 tab.

J. T. Visscher, J. M., L., y G. C., G., «Performance evaluation of dynamic roughing filtration», in Advances in slow sand and alternative biological filtration, 1996, pp. P. 349-358 : 5 fig., 3 tab.

B. J. Lloyd, Visscher, J. T., y G. C., G., «Overcoming water quality limitations with the multi-barrier concept : a case study from Colombia», in Slow sand filtration : an international compilation of recent scientific and operational developments, 1994, pp. P. 47-60: fig., 3 tab.

J. T. Visscher, G. C., G., y Fernandez, J., «Comparative study of different pre-treatment alternatives», Aqua : journal of water supply research and technology, pp. p. 337-346: 7 fig., 5 tab., 1993.