Ortiz J.J, M., a., and J. Alfonso. “Bismuth Coatings Deposited by the Pulsed Dc Sputtering Technique”. Revista Mexicana De Física, vol. 59, no. 4, Jan. 2013, pp. 374-0, https://rmf.smf.mx/ojs/index.php/rmf/article/view/4013.