Biblio

B. J. Lloyd, Clarke, B. A., Crompton, J. L., y Major, I. P., «Cleaning of upflow gravel prefilters in multistage filtration water treatment plants», in Advances in slow sand and alternative biological filtration, 1996, pp. P. 391-401 : 10 fig., 1 tab.

B. J. Lloyd, Clarke, B. A., Jones, C. J., y Evans, H. L., «Water treatment by multistage filtration utilising gravel prefilters and fabric enhanced slow sand filters», in Advances in slow sand and alternative biological filtration, 1996, pp. P. 313-326 : 12 fig., 2 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.

B. J. Lloyd, Wheeler, D., Pardon, M., y Symonds, C. N., «Aspects of prefiltration concerned with the application of small scale slow sand filtration in rural communities». University of Surrey, Department of Microbiology, Guildford, UK, p. 112 p.: fig., tab., photogr., 1985.