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Chesley, Steven R.; Chodas, Paul W.; Milani, Andrea; Valsecchi, Giovanni B.; Yeomans, Donald K. (October 2002). "Quantifying the risk posed by potential Earth impacts". Icarus. 159 (2): 423––432. Bibcode:2002Icar..159..423C. doi:10.1006/icar.2002.6910.