“July 19th : priceless : a survey of water”,
The Economist. Economist Intelligence Unit, EIU, London, UK, p. 16 p. :1 box., 6 fig., 1 map, photogr., 1 tab.
V. Lazarova,
“Wastewater reuse : a sustainable water resource in the Middle East and Africa”. Suez Lyonnaise des Eaux, Technology and Research Centre (CIRSEE), Le Pecq, France, p. 17 p. : 9 fig., 3 tab.