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* WHO (2006). [https://www.who.int/water_sanitation_health/publications/gsuweg3/en/ Guidelines for the Safe Use of Wastewater, Excreta and Greywater. Volume 3: Wastewater and Excreta Use in Aquaculture]. World Health Organization, Geneva, CH.
* [http://www.who.int/water_sanitation_health/publications/guidelines-on-sanitation-and-health/en/ WHO: Guidelines on sanitation and health - 2018]