P. E. Comite Nac Lima,
« Plan nacional de saneamiento basico ». Comite Nacional de Coordinacion de Saneamiento Basico, Lima, Peru, p. 3 vol. (155, 17, 71 p.): fig., tab., 1986.
V. P. Deshpande, Gadkari, S. K., Badrinath, S. D., et Kaul, S. N.,
« Review on a new concept in water treatment : pebble bed flocculator »,
Journal of Indian Water Works Association, p. p. 295-299 : 1 fig., 1 tab., 1986.
WHO -Geneva, CH, World Health Organization et Copenhagen, D. K. D. A. N. I. D. A. -,
« WHO/DANIDA workshop on water supply and sanitation information for sectoral management, Mangochi, Malawi, 10-14 November, 1986 ». World Health Organization (WHO), Geneva, Switzerland, p. 43, 98 p., 1986.