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~o l . AP-13. pp. 943-957. November 1965. permeability of a mlxture of solids," Physica, D. Polder and J. H. van Santen. 'The effective vol. 12. pp. 257-271, August 1956. 1 ' . Frank. "On the penetration of a static homogeneous field in an anisotropic medium into an ellipsoidal i n c h s i p consisting of another anisotropic medium in Symposium on Eled70rnaenelic Theorv 'and Anfennas. June 1962. Oxford: PeFgamon pp.-615-623. J. C. M-vell, A Treatise on Eleclricity and Mapnetism. 3rd ed.. 1891. New York: Dover. 1954. pt I1 P. 66. of Continuous Media. Reading, Mass.: Addison-L.'D.'Landau and E. M. Lifshitz. lZlecfrodynamics Wesley, 1960, PP. 45-47,

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