1. B. house, New Delhi, 1990, p. 429.
2. W.H. Von Aulock, A.H. Bobeck, Ferrimagnetism: The Encyclopedia of physics, in: Robert M. Besancon, (Ed.), third ed., Van Nostrand Reinold, New York, 1990, p. 429.
3. K.J. Viswanathan, V.R.K. Murthy, Ferrite Materials: Science and Technology (Narosa publishing Standley, Oxide Magnetic Materials (Clarendon Press, Oxford, 1962), p. 36.
4. Magnetic properties of W-type ferrites
5. Characterization of M-type barium hexagonal ferrite-based wide band microwave absorber