A theory advanced in 1987 as an explanation of the ubiquitous character of noise power-spectra has been partly confirmed by sophisticated measurements of a pile of sand.
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Maddox, J. Sandpiles as a paradigm of noise. Nature 347, 225 (1990). https://doi.org/10.1038/347225a0
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DOI: https://doi.org/10.1038/347225a0