1. Fabula, A. G., Fourth Intern. Cong. Rheol., 3, 455 (1964).
2. Ruszczyeky, M. A., Nature, 205, 614 (1965).
3. Uhlherr, P. H. T., et al., Chem. Eng. Sci., 20, 997 (1965).
4. Weiselberger, C., Ergeb. Aerodyn. Ver. Göttingen, 2, 22 (1923).
5. Prandl, L., and Tietjens, O. G., Applied Hydro and Aeromechanics, 98 (Dover, 1957).