Pil Woo Heo and  Hyunse Kim,  Separation Characteristics of the Hollow Fiber Membrane Module Using Water Mixed with Small Sized Bubbles Composed of Synthesized Exhalations.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2018, vol. 137(5). 399 - 402
    [viewed 20 January 2022]. Available from: https://publications.waset.org/pdf/10009232.