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3. R. P. Huebener, R. T. Kampwirth, and V. A. Rowe, to be published.
4. G. D. Cody and R. E. Miller,Phys. Rev. 173, 481 (1968).
5. W. F. Brown,Magnetostatic Principles in Ferromagnetism (North-Holland, Amsterdam, 1962), p. 192.