1. United Nations http://www.un.org/waterforlifedecade/scarcity.shtml (2014), [cited 22.04.15].
2. Houston-Galveston, Texas: Managing Coastal Subsidence, in Land Subsidence in the United States;Coplin,1999
3. Water Quality and Treatment: A Handbook of Community Water Supplies;Letterman,1999
4. Encyclopedia of Membrane Science and Technology;In: Hoek,2013
5. Fate of viruses in water systems;Xagoraraki;J. Environ. Eng.,2014