Medina, A., M. Pliego, and F. Higuera. “Deformation of an Elastic Cylindrical Tube Filled With Water and a Dry Granular Material”. Revista Mexicana De Física, vol. 62, no. 2 Mar-Apr, Jan. 2016, pp. 89-0, https://rmf.smf.mx/ojs/index.php/rmf/article/view/4180.