Rolling firction for DEM
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Assessment of rolling resistance models in discrete element simulations Original Research Article
Powder Technology, Volume 206, Issue 3, 30 January 2011, Pages 269-282
Jun Ai, Jian-Fei Chen, J. Michael Rotter, Jin Y. Ooi
Time step selection
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Catherine O'Sullivan, Jonathan D. Bray, (2004) "Selecting a suitable time step for discrete element simulations that use the central difference time integration scheme", Engineering Computations, Vol. 21 Iss: 2/3/4, pp.278 - 303