1. Nedderman, R.M.: Statics and Kinematics of Granular Materials. Cambridge University Press, Cambridge (2005)
2. Ennis, B.J., Green, J., Davies, R.: The legacy of neglect in the US. Chem. Eng. Prog. 90(4), 32–43 (1994)
3. Cundall, P.A., Strack, O.D.L.: A discrete numerical model for granular assemblies. Geotechnique 29, 47–65 (1979)
4. Johnstone, M.W.: Calibration of DEM Models for Granular Materials Using Bulk Physical Tests. Doctor of Philosophy, The University of Edinburgh (2010)
5. Kruggel-Emden, H., Simsek, E., Rickelt, S., Wirtz, S., Scherer, V.: Review and extension of normal force models for the discrete element method. Powder Technol. 171(3), 157–173 (2007). doi: 10.1016/j.powtec.2006.10.004