Palomares Sánchez, S., S. Ponce-Castañeda, J. Martínez, and Facundo Ruiz. “Determination of Phases of $\alpha $-Fe$_{2}$O$_{3}$:SiO$_{2}$ Compound by the Rietveld Refinement”. Revista Mexicana De Física, vol. 48, no. 5, Jan. 2002, pp. 438-0, https://rmf.smf.mx/ojs/index.php/rmf/article/view/3088.