1. G. Bate, in: D.J. Craik (Ed.), L: Magnetic Oxides, Part 2. Wiley Interscience, New York, 1975, p. 703.
2. Particulate magnetic recording media: a review
3. P.I. Slick, in: E.P. Wohlfrath (Ed.), Ferromagnetic Materials, vol. 2, North-Holland, Amsterdam, 1980, p. 796.
4. Material concepts in Surface Reactivity and Catalysis;Wise,1990