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References:
[1] Marsden, B.: IAU Circular No. 5636 (1992), Cambridge, MA, USA.
[2] Marsden, B.: IAU Circular No. 5671 (1992), Cambridge, MA, USA.
[3] Marsden, B.: In op. [4] (1992).
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[7] Grieve, R. A. F.: Terrestrial impact structures. Annual Rev. Earth. Planet. Sci. 17 (1987), 245.
[8] Weissman, P. R.: Dynamical history of the Oort cloud. In: Comets in the Post-Halley Era (R. L. Newburn, M. Neugebauer, J. Rahe, eds.), Kluwer Academic Publishers (1991), Dordrecht.
[9] Schultz, P. H., Lianza, R. E.: Nature. 355 (1992), 234.
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