Bhuiyan, M. A.; Hoque, S. M.; Choudhury, S. Effects of Sintering Temperature on Microstructure and Magnetic Properties of NiFe<sub>2< sub>O<sub>4< sub> Prepared from Nano Size Powder of NiO and Fe<sub>2< sub>O<sub>3< Sub>. J Bangladesh Acad Sci 2011, 34, 189-195.