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P. P.  Hankare, Vader, V. T., Sankpal, U. B., Patil, R. P., Jadhav, A. V., and Mulla, I. S., ?Synthesis and characterization of cobalt substituted zinc ferri-chromites prepared by sol-gel auto-combustion method?, Journal of Materials Science-Materials in Electronics, vol. 22, no. 8, pp. 1109-1115, 2011.