Córdoba-Rodríguez, O., M. del Castillo-Mussot, J. Montema, and or-Aldrete. “Some Studies on Safe Maximum Packing of Live Agents in Crowds or Containers”. Revista Mexicana De Física, vol. 55, no. 6, Jan. 2009, pp. 450-0, https://rmf.smf.mx/ojs/index.php/rmf/article/view/3715.