1. Water for people water for life, executive summary, Tech. rep. , The United Nations World Water Development Report 2003
2. The millennium development goals report Tech. rep. , United Nations, New York, 2008
3. A. Hammond The next 4 billion: Market size and business strategy at the base of the pyramid, Tech. rep. , Published by World Resource Institute 2007
4. C. K. Prahalad A. Hammond Serving the world's poor profitably, Har. Bus. Rev. 4-11 2002
5. J. Fawell K. Bailey J. Chilton E. Dahi L. Fewtrell Y. Magara Fluoride in drinking-water, in WHO Drinking-water Quality Series, IWA Publishing, London 2006