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by Kantorovich, Boris IAkovlevich
Book 109 p. Minsk : Nauka i tekhnika, 1979

Available in the Research Room

by Girginov, Girgin
Book 329 p. [Budapest] : Kossuth, 1979

Available in the Research Room

Book 110 p. Uzhhorod : Ordena Druzhby narodiv vyd-vo "Karpaty," 1979

Available in the Research Room

by Narodno-trudovoi soiuz
Book 71 p. Frankfurt am Main : Possev, [1979]

Available in the Research Room