1. J. Smit, H.P.J. Wijn, Ferrites, Philips Technical Library, Eindhoven, 1959.
2. Barium ferrite media for perpendicular recording
3. Permanent Magnet Materials and their Application;Campbell,1994
4. Super Particle Technology;Ichnose,1992
5. Radar Absorbing Materials;Viney,1996