6:
I. Albert, P. Tegzes, B. Kahng, R. Albert, J.G. Sample, M.A. Pfeifer, A.-L. Barabási, T. Vicsek, P. Schiffer Jamming and fluctuations in granular drag Physical Review Letters 84, 5122–5125 (2000).
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7:
I. Albert, P. Tegzes, R. Albert, J. G. Sample, A.-L. Barabási, T. Vicsek, B. Kahng, P. Schiffer Stick-slip fluctuations in granular drag Physical Review E 64, 031307 (2001).
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