Sombat Maneesuk และ Witaya Yoosook. (2010) Removal efficiency of Spiral Sheet Cyclone for sand dust. Mahidol University:ม.ป.ท.Sombat Maneesuk และ Witaya Yoosook. 2010. Removal efficiency of Spiral Sheet Cyclone for sand dust. ม.ป.ท.:Mahidol University;Sombat Maneesuk และ Witaya Yoosook. Removal efficiency of Spiral Sheet Cyclone for sand dust. ม.ป.ท.:Mahidol University, 2010. Print.