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Helbing, D., Jost, J. & Kantz, H. Nonlinear Physics Everywhere: From Molecules to Cities. Eur. Phys. J. B 63, 283 (2008). https://doi.org/10.1140/epjb/e2008-00248-0
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DOI: https://doi.org/10.1140/epjb/e2008-00248-0