Daniel Sudarsk., Hern., o Quevedo., ., and Marcelo Salgado. “Cosmological Dark Matter and Galactic Periodicity”. Revista Mexicana De Física, vol. 43, no. 5, Jan. 1996, pp. 699-10, https://rmf.smf.mx/ojs/index.php/rmf/article/view/2695.