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2. The Complete Handbook of Magnetic Recording;Jorgensen,1980
3. The permeance in magnetic circuits;Berglund;Journal of Magnetism and Magnetic Materials,1980
4. Sam Enger, Magnetberäkningar Permeauser I Luftgap, Dissertation, KTH, Stockholm, (1977).
5. Transmission line model for magnetic heads including complex permeability;Corcoran;Journal of Magnetism and Magnetic Materials,1986