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Message * Ėkologicheskie Modifikat︠s︡ii i Kriterii Ėkologicheskogo Normirovanii︠a︡ Trudy Mezhdunarodnogo Simpoziuma, Sssr, Nalʹchik, 1-12 Ii︠u︡ni︠a︡ 1990 G. - 5286009344 - 9785286009343