Karimi, M., M. Mostoufi, R. Zarghami, and R. Gharebagh. “Validation of a DEM Modeling of Gas-Solid Fluidized Bed Using the S-Statistic in the State-Space Domain”. The International Journal of Multiphysics, vol. 5, no. 1, Mar. 2011, pp. 79-88, doi:10.1260/1750-9548.5.1.79.