Jaime García Prieto., and Octavio Novaro. “Optical Spetra of Matrix-Isolated Palladium Atoms. 3. Matrix Effects on the Electronic Structure of Pd Atoms”. Revista Mexicana De Física, vol. 43, no. 1, Jan. 1996, pp. 130-58, https://rmf.smf.mx/ojs/index.php/rmf/article/view/2648.