Aunnop Wongrueng และ Suraphong Wattanachira. (2005) Groundwater defluoridation by ultra low pressure reverse osmosis membrane and nano filtration membrane. Chulalongkorn University:ม.ป.ท.Aunnop Wongrueng และ Suraphong Wattanachira. 2005. Groundwater defluoridation by ultra low pressure reverse osmosis membrane and nano filtration membrane. ม.ป.ท.:Chulalongkorn University;Aunnop Wongrueng และ Suraphong Wattanachira. Groundwater defluoridation by ultra low pressure reverse osmosis membrane and nano filtration membrane. ม.ป.ท.:Chulalongkorn University, 2005. Print.