Jotania, R. B.; Khomane, R. B.; Deshpande, A. S.; Chauhan, C. C.; Kulkarni, B. D. Physical and Magnetic Properties of Barium Calcium Hexaferrite Nano-Particles Synthesized by Water-in-Oil Reverse Micelle and Co-Precipitation Techniques. J. Sci. Res. 2008, 1, 1-13.