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Message * Dŭrzhavata Na Dukha Chetvŭrta Nat︠s︡ionalna Nauchna Konferent︠s︡ii︠a︡ S Mezhdunarodno Uchastie : Sofii︠a︡, 1 Noemvri 2006 - 9548887290 - 9789548887298