Rasool, R., and رعد. “Determination of the Optimal Concentration of Ions Zn2+ in the Flex-Free System Mn-Zn through the Study of Electrical and Magnetic Susceptibility Characteristics”. Journal of Education and Science (JES), vol. 17, no. 1, Jan. 2005, pp. 166-77, doi:10.33899/edusj.2005.80502.