Laín, S., and R. Aliod. “Analytic Expressions for Interface Terms in General Dispersed two–phase Flow Laden With arbitrary–shaped Dispersed Elements”. Ingeniería Y Ciencia, vol. 4, no. 7, June 2008, pp. 47-69, https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/228.