Synthesis and characterization of structural, and electrical properties of Mg(0.25x)Cu(0.25x)Zn(1 – 5x)Fe2O4 ferrites by sol-gel method - M. Shahjahan; S. M. Talukder; M. S. Hossain; M. H.A. Begum; R. L. Warnock; M. A. Haque; M. Hossain; N. A. Ahmed (Ukrainian journal of physics, 2019)