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Cates, M. E.; Wittmer, J. P.; Bouchaud, J.-P.; Claudin, P. . (1998). Jamming, Force Chains, and Fragile Matter. Physical Review Letters, 81(9), 1841–1844. doi:10.1103/physrevlett.81.1841 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research