Zaulychnyy, Ya.V., et al. “The Relationship Between the Distribution of Valence Electrons and Electrochemical Properties of Mixtures α-Fe2O3 Al2O3, α-Fe2O3 SiO2 and γ-Fe2O3 SiO2 Before and After Mechanical Activation Synthesis”. Physics and Chemistry of Solid State, vol. 16, no. 4, Dec. 2015, pp. 679-84, doi:10.15330/pcss.16.4.679-684.