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Nurmi P., Valtonen M.J. & Zheng J.Q. Periodic variation of Oort Cloud flux and cometary impacts on the Earth and Jupiter. Monthly Notices of the Royal Astronomical Society. 2001, 327 (4): 1367–1376. Bibcode:2001MNRAS.327.1367N. doi:10.1046/j.1365-8711.2001.04854.x.