... | ... | @@ -53,7 +53,7 @@ The discussion so far only considered disc particles. An unproved empirical expe |
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[3] [Howell, Daniel, R. P. Behringer, and Christian Veje. "Stress fluctuations in a 2D granular Couette experiment: a continuous transition." Physical Review Letters 82.26 (1999): 5241.](https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.82.5241)
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[4] *Y. Zhao et al., unpublished.*
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[4] [Yiqiu Zhao et al., 2019 New J. Phys. 21 023009](https://iopscience.iop.org/article/10.1088/1367-2630/ab05e7/meta)
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