Xuan Thang, D. 2004. STUDYING AND APPLYING THE EFFECTION OF WHIRLING AIR STREAM ESTABLISHING CENTRIPETAL WET-FILTER PRINCIPLE. Science and Technology Development Journal. 7, 11 (Nov. 2004), 79-84. DOI:https://doi.org/https://doi.org/10.32508/stdj.v7i11.3282.