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1. V. A. Shefer: Method for High-accuracy Determinations of Orbits of Small Bodies from Three Observations // 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, 65–69 (2010)
2. V. A. Shefer: Determination of an Intermediate Perturbed Orbit from Range and Range Rate Measurements at Three Time Instances // 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, 70–74 (2010)
3. V. A. Shefer: Superosculating intermediate orbits and their applications to study the perturbed motion // Transactions of IAA RAS, issue 8, 155–156 (2002)
4. V. A. Shefer: Determination of preliminary orbits including perturbations // Transactions of IAA RAS, issue 8, 157–158 (2002)