1. P. I. Richards ,Manual of Mathematical Physics. Pergamon Press , London , p. 197 ( 1959 ).
2. M. M. Schieber ,Experimental Magnetochemistry. Interscience Pub., John Wiley & Sons, Inc. , New York . p. 35 ( 1967 ).
3. U. T. Andres , et al.Magnetohydrodynamic and Magnetohydrostatic Methods of Mineral Separation, Keter Publishing House , Jerusalem LTP , pp. 224 ( 1976 ).