1. Reynolds, O.: Experiments showing dilatancy, a property of granular material, possibly connected with gravitation. Proc. Roy. Inst. Great Britain 2, 354–363 (1886)
2. Bagnold, R.A.: Experiments on a gravity-free dispersion of large solid spheres in a Newtonian fluid under shear. Proc. Roy. Soc. A 225, 49 (1954)
3. Bagnold, R.A.: The shear and dilatation of dry sand and the ‘singing’ mechanism. Proc. Roy. Soc. A 295, 219 (1966)
4. Amon, A., et al.: Preface: focus on imaging methods in granular physics. Rev. Sci. Instr. 88, 051701 (2017)
5. Tsai, J.-C., Voth, G.A., Gollub, J.P.: Internal granular dynamics, shear-induced crystallization, and compaction steps. Phys. Rev. Lett. 91, 064301 (2003)