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Message * Fridmanovskie Chtenii︠a︡ Vserossiĭskai︠a︡ Nauchnai︠a︡ Konferent︠s︡ii︠a︡, G. Permʹ, 7-12 Senti︠a︡bri︠a︡ 1998 G. : Tezisy Dokladov - 5794400722 - 9785794400724