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- L. L. Sokolov, N. P. Pitjev, V. Sh. Shaidulin: About Zones of Resonant Returns of Asteroid Apophis // 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, 279–283 (2010)