Friction in granular layers: Hysteresis and precursors. Nasuno, S., Kudrolli, A., & Gollub, J. P. Physical Review Letters, 79(5):949, 1997.
Friction in granular layers: Hysteresis and precursors [link]Paper  bibtex   
@article{nasuno_friction_1997,
	title = {Friction in granular layers: {Hysteresis} and precursors},
	volume = {79},
	shorttitle = {Friction in granular layers},
	url = {http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.79.949},
	number = {5},
	urldate = {2016-03-12TZ},
	journal = {Physical Review Letters},
	author = {Nasuno, S. and Kudrolli, A. and Gollub, Jerry P.},
	year = {1997},
	pages = {949}
}

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