The science of pedestrian motion meets the annual Hajj in Mecca.
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References
Helbing D., et al. preprint available at http://arxiv.org/abs/physics/0701203
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Ball, P. Crowd researchers make pilgrimage safer. Nature (2007). https://doi.org/10.1038/news070115-13
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DOI: https://doi.org/10.1038/news070115-13