1. P.A. Cundall, O.D.L. Strack, Geotechnique 29(1), 47 (1979)
2. A. Jensen, K. Fraser, G. Laird, International LS-DYNA users conference 1, 1 (2015)
3. W.M. Johnstone, Doctor of philosophy (The University of Edinburgh, Edinburgh, 2010), pp. 1–50
4. Y.-C. Chung, Doctor of philosophy (The University of Edinburgh, Edinburgh, 2006), pp. 1–24
5. ISO 902:1976, Aluminum oxide primarily used for the production of aluminum—measurement of the angle of repose,
https://www.iso.org/standard/5306.html
. Accessed 06 Jan 2019