1. H. Lamb:Hydrodynamica, 4th ed. (Cambridge, 1916), p. 572, 591.
2. V. Gallina, R. Malvano andM. Omini:Rev. Sci. Instr.,42, No. 11 (1971).
3. C. Andrade andY. S. Chiong:Proc. Phys. Soc.,48, 247 (1936).
4. E. Minetti-Mezzetti:Rev. Roum. Phys.,21, 805, 976 (1976).
5. D. Barbero, R. Malvano, E. Minetti-Mezzetti andM. Omini:Phil. Mag.,30, 129 (1974).