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Message * Studencheskai︠a︡ Nauka--V Deĭstvii Sbornik Materialov Xxxix Nauchnoĭ Studencheskoĭ Konferent︠s︡ii : G. Sterlitamak, Sterlitamakskiĭ Gosudarstvennyĭ Pedagogicheskiĭ Institut, 12-17 Apreli︠a︡ 1999 G. - 5861111367 - 9785861111362