Paths to self-organized criticality

@article{Dickman2000PathsTS,
  title={Paths to self-organized criticality},
  author={Ronald Dickman and Miguel Angel Mu{\~n}oz and Alessandro Vespignani and Stefano Zapperi},
  journal={Brazilian Journal of Physics},
  year={2000},
  volume={30},
  pages={27-41}
}
We present a pedagogical introduction to self-organized criticality (SOC), unraveling its connections with nonequilibrium phase transitions. There are several paths from a conventional critical point to SOC. They begin with an absorbing-state phase transition (directed percolation is a familiar example), and impose supervision or driving on the system; two commonly used methods are extremal dynamics, and driving at a rate approaching zero. We illustrate this in sandpiles, where SOC is a… 

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