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Message * Ėkologicheskoe Soznanie - Ėkologicheskai︠a︡ Bezopasnostʹ Iv Mezhdunarodnyĭ Nauchno-Prakticheskiĭ Seminar, G. Kaluga, 9-11 Okti︠a︡bri︠a︡ 1997 G. - 5887250100 - 9785887250106