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Message * Nekotorye Aktualʹnye Problemy Sovremennoĭ Matematiki i Matematicheskogo Obrazovanii︠a︡ Materialy Nauchnoĭ Konferent︠s︡ii Gert︠s︡enovskie Chtenii︠a︡-- 2007, 16-21 Apreli︠a︡ 2007 - 5336000558 - 9785336000559