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Message * Issledovanii︠a︡ Po Teorii Different︠s︡ruemykh Funkt︠s︡iĭ Mnogikh Peremennykh Iee Prilozhenii︠a︡m, Ch. 15 Posvi︠a︡shchaetsi︠a︡ Akademiku Sergei︠u︡ Mikhaĭlovichu Nikolʹskomu K Ego Vosʹmidesi︠a︡tiletii︠u︡ - 502000264X - 9785020002647