1. The behaviour of particles in a sinusoidal velocity field
2. Houghton, G., “Levitation of Incompressible Spheres by Hydro-dynamic Vibrations”, unpublished.
3. Feinman, J. and Houghton, G., unpublished
4. (cf. Feinman, J., “An Experimental Study of the Behaviour of Solid Spheres in Oscillating Liquids”, Ph.D. Thesis, Univ. of Pittsburgh, 1964).
5. Flooding characteristics of a pulse extraction column