Biblio

G. G. C., J. M., L., y Visscher, J. T., Filtracion en multiples etapas : tecnologia innovativa para el tratamiento de agua, vol. no. 34-S. Cali, Colombia: CINARA, 1999, p. 197 p. : 68 fig., 60 tab.

J. T. Visscher, J. M., L., y G. C., G., Multi-stage filtration : an innovative water treatment technology, vol. no. 34-E. The Hague, The Netherlands: IRC, 1998, p. xiii, 165 p. : 68 fig., 60 tab.

J. E. M. Smet, Visscher, J. T., y G. C., G., «Slow sand filter design and construction : learning from experience», in Slow sand filtration : an international compilation of recent scientific and operational developments, 1994, pp. P. 28-37, 306: 4 fig., 2 tab.