Cárdenas-García, D., E. López-Téllez, ., and C. Ruiz-Mejía. “About the Mott and Littleton Method for Calculating the Formation Energy of Point Defects”. Revista Mexicana De Física, vol. 36, no. 4, Jan. 1989, pp. 555-6, https://rmf.smf.mx/ojs/index.php/rmf/article/view/2142.