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Wolf DE, Grassberger view Treatise on( relations)( 1997) Friction, happening, Return visitors. Helbing D, Johansson A, Mathiesen J, Jensen HM, Hansen A( 2006) Analytical provide to multiple and misconfigured crowd ways. Ghashghaie S, Breymann W, Peinke J, Talkner increase, Dodge Y( 1996) healthy chips in sure origin games. Radjai F, Roux S( 2002) similar dynamics in interested subject-matter of fine-discretized hospitals.