Fujita, S., T. Kimura, Y. Zheng, ., and S. Godo. “Theory of Superconductivity. New Formula for the Critical Temperature”. Revista Mexicana De Física, vol. 38, no. 6, Jan. 1991, pp. 914-28, https://rmf.smf.mx/ojs/index.php/rmf/article/view/2291.