Biblio

F. R. C. E. F. I. G. R. E. - S. Antipolis and Geneva, C. H. Collaborat, “ESA collaborative council meeting, Sophia Antipolis, France, November 28 - December 1, 1989 : proceedings”. ESA Collaborative Council, Environmental Health Div., World Health Organization, Geneva, Switzerland, p. various paging, 1990.

WHO -Geneva, CH, World Health Organization and Geneva, C. H. Collaborat, “International Drinking Water Supply and Sanitation Decade : 1990 Committee, Geneva, 31 May to 2 June 1989”. World Health Organization (WHO), Geneva, Switzerland, p. 24 p., 1989.