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3. Reinvent the Toilet Challenge & Expo-Bill & Melinda Gates Foundationhttps://www.gatesfoundation.org/what-we-do/global-growth-and-opportunity/water-sanitation-and-hygiene/reinvent-the-toilet-challenge-and-expo
4. A Guide to Decisionmaking Technology Options for Urban Sanitation in India;Parkinson;Water Sanit. Program. South. Asia World Bank New Delhi,2008
5. Working Paper 168 Resources Recovery in South and Southeast Asiahttps://papers.ssrn.com/sol3/papers.cfm?abstract_id=3293535