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- J. J. Smulsky, Ya. J. Smulsky: Evolution of Apophis Orbit for 1000 Years and New Space Targets // Protecting the Earth against Collisions with Asteroids and Comet Nuclei, In: A. M. Finkelstein, W. F. Huebner, V. A. Shor (Eds) Proceedings of the International Conference “Asteroid-Comet Hazard-2009”, StP: Nauka, 390–395 (2010)