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Caprioli, A., Manzoni, S. & Zappa, E. People-induced vibrations of civil structures: Image-based measurement of crowd motion. Exp Tech 35, 71–79 (2011). https://doi.org/10.1111/j.1747-1567.2009.00574.x
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DOI: https://doi.org/10.1111/j.1747-1567.2009.00574.x