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[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).
[4] Near-Earth-Objects Interception Workshop. (1992) (G. H. Canavan, J. C. Solem, J. D. G. Rather, eds.), LA-1246-C, Los Alamos, USA.
[5] Ceplecha, Z.: Influx of interplanetary bodies onto Earth. Astronomy and Astroph. 263 (1992), 361.
[6] Alvarez, L. W., Alvarez, W., Asaro, F., Michel, H.: Extraterrestrial cause for C-T extinction. Science 208 (1980), 1095.
[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.
[10] Glasstone, S., Dolan, P. J.: The Effects of Nuclear Weapons. U. S. Goverment Printing Office (1977), Washigton D. C.
[11] Rahe, J., Vanýsek, V., Weissman, P.: The core of comets. In: Cosmic Impacts Hazard, Arizona Uni. Press (1993), Tuscon AZ, USA, v tisku.
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