1. L.S. Leung, R.J. Wiles, D.J. Nicklin, The design of vertical pneumatic conveying systems, Proc. 1st Intern. Conf. on Pneumatic Transport of Solids in Pipes, Cambridge, Sept. 1971, BHRA Fluid Engineering, Cranfield, U.K. p.,93-104
2. Vertical pneumatic conveyer with a fluidized bed as mixing zone