1. 1) Konrad, K., D. Harrison, R. M. Nedderman and J. F. Davidson : “Prediction of the Pressure Drop for Horizontal Dense Phase Pneumatic Conveying of Particles”, Proceedings of 5th conference BHRA Fluid engineering, Paper E1, 225-244 (1986)
2. 2) Kano, T., F. Takeuchi, Y. Kondo, M. Utsumi, T. Maeda and K. Takemura : “An Experimental Study of the Technics of Reduction of Granular Materials -Effects of Pulsating Motion of Conveying Air and Vibratory Motion of Conveying Pipe-”, Soc. Chem. Eng., Japan, 9, 5, 477-481 (1983)
3. A system for powder transport based on piezoelectrically excited ultrasonic progressive waves
4. Pressure Drop Reduction by Applying Ultrasonic for Plug Transportation of Granular Particles
5. Critical Plug Length at Natural Plug Formation.