1. Composite reverse osmosis and nanofiltration membranes;Petersen;J. Membr. Sci.,1993
2. Recent developments in reverse osmosis desalination membranes;Li;JMCh,2010
3. T.R. Malthus, An Essay on the Principle of Population, 1798.
4. Comprehensive Assessment of the Freshwater Resources of the World, World Meteorological Organization, (1997) 9.
5. Water and nonwater-related challenges of achieving global sanitation coverage;Fry;Environ. Sci. Technol.,2008