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Message * Molodezhʹ i Nauka Problemy i Perspektivy : Ii Oblastnai︠a︡ Konferent︠s︡ii︠a︡ Studentov, Aspirantov i Molodykh Uchenykh : Fiziko-Matematicheskai︠a︡ Sekt︠s︡ii︠a︡ : Tezisy Dokladov, 13-15 Apreli︠a︡ 1998 G. - 5894280222 - 9785894280226