1. Some exact mathematical solutions for granular stock piles and granular flow in hoppers;Cox;Math. Mech. Solids,2003
2. G.M. Cox, J.M. Hill, Some exact velocity profiles for granular flow in converging hoppers, Zeitschrift Angew. Math. Physik (ZAMP) 56 (2005) 92–106.
3. N.J. Bradley, Gravity flows of granular materials, Ph.D. Thesis, University of Nottingham, 1991.
4. A.J.M. Spencer, N.J. Bradley, Gravity flow of granular materials in converging wedges and cones, in: K.Z. Markov (Ed.), Proceedings of the Eighth International Symposium on Continuum Modes and Discrete Systems, 11–16 June 1995, Varna, Bulgaria, World Scientific, 1996, pp. 581–590.
5. Stress distributions in highly frictional granular heaps;Thamwattana;Zeitschrift Angew. Math. Physik (ZAMP),2004