Rahman, M. M., P. K. Halder, F. Ahmed, T. Hossain, and M. Rahaman. “Effect of Ca-Substitution on the Magnetic and Dielectric Properties of Mn-Zn Ferrites”. Journal of Scientific Research, vol. 4, no. 2, Apr. 2012, p. 297, doi:10.3329/jsr.v4i2.9752.