Jaimes, J., G. G, E. Geffro, {\&} B. Mena., and J. R. “Pattern Formation in Oscillatory Granular Flows”. Revista Mexicana De Física, vol. 48, no. 6, Jan. 2002, pp. 534-0, https://rmf.smf.mx/ojs/index.php/rmf/article/view/3102.