WASET
    Young-Kwan Choi and  Gang-Wook Shin and  Sung-Taek Hong,  A Study on Energy Efficiency of Vertical Water Treatment System with DC Power Supply.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2014, vol. 86(2). 227 - 232
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/9997396.