Geodesic
Проблема различения центра и фокуса в классе ростков
Vestnik Chelyabinskogo Gosudarstvennogo Universiteta. Matematika, Mekhanika, Informatika, no. 9 (2003), pp. 86-110
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     journal = {Vestnik Chelyabinskogo Gosudarstvennogo Universiteta. Matematika, Mekhanika, Informatika},
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N. B. Medvedeva. Проблема различения центра и фокуса в классе ростков. Vestnik Chelyabinskogo Gosudarstvennogo Universiteta. Matematika, Mekhanika, Informatika, no. 9 (2003), pp. 86-110. http://geodesic.mathdoc.fr/item/VCHGU_2003_9_a5/

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