EAWAG -Duebendorf, CH, Swiss Federal Institute for Environmental Science and Technology y WSSCC -Geneva, CH, Water Supply and Sanitation Collaborative Council,
«Summary report of Bellagio Expert Consultation on Environmental Sanitation in the 21st Century, 1-4 February 2000». Water and Sanitation in Developing Countries (SANDEC), Duebendorf, Switzerland, p. 18 p., 2000.