Kakovkina, O. (2019). Diplomatic Activity of the People’s Republic of Bulgaria in Ukraine on the basis of the Central State Archives of Public Organizations of Ukraine (TsDAGO). Universum Historiae Et Archeologiae = The Universe Of History And Archeology = Універсум історії та археології = Универсум истории и археологии ISSN 2664-9950 (Print) ISSN 2707-6385 (Online), 1(1-2), 68–80. doi:10.15421/2611809