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Message * Problemy Optimizat︠s︡ii i Ėkonomicheskie Prilozhenii︠a︡ Mezhdunarodnai︠a︡ Konferent︠s︡ii︠a︡, 1-5 Ii︠u︡li︠a︡ 1997 G., Omsk : Tezisy Dokladov - 577790050X - 9785777900500