The sandpile, forest-fire and slider-block models are said to exhibit self-organized criticality.
S. G. Abaimov, D. L. Turcotte, R. Shcherbakov, J. B. Rundle 2007, 'Recurrence and interoccurrence behavior of self-organized complex phenomena', Nonlinear Processes in Geophysicshttp://www.nonlin-processes-geophys.net/14/455/2007/npg-14-455-2007.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)