Abu Ubaiddha, S.

S. Ubaiddha, A. & Liyanage, R.S., 2003. Low-cost tanks and filters in Sri-Lanka, Loughborough, UK: Water, Engineering and Development Centre, Loughborough University of Technology, WEDC. Available at: https://es.ircwash.org/sites/default/files/Ubaiddha-2003-Low-cost.pdf.