1. T. G. Cowling,Magnetohydrodynamics(Interscience Publishers, Inc., New York, 1957), p. 3.
2. See reference 2, p. 58.
3. The stability of viscous flow between rotating cylinders in the presence of a magnetic field
4. Corcoran, Opfell, and Sage,Momentum Transfer in Fluids(Academic Press, Inc., New York, 1956), pp. 28–30.