There are many articles about self-organized criticality (SOC). I have here collected links to some of my online articles on SOC. These articles contain many references, which should lead you further in your study of SOC.
General overview articles
Introduction to self-organized criticality – part 1
Introduction to self-organized criticality – part 2
Articles about the brain as a critical system
Overview article “The Brain as a critical system”
Detrended fluctuation analysis: A scale-free view on neuronal oscillations
Fast network oscillations in vitro exhibit a slow decay of temporal auto-correlations
Overview of self-organized criticality (SOC)
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