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Bulgaria i nejnite susedi, 1931-1939 : Političeski i diplomatičeski otnošenija
Mančev, Krustju, (1978)
Hitler et la Yougoslavie
Čulinovič, Ferdo, (1972)
From recognition to repudiation : Bulgarian attitudes on the Macedonian question ; Articles, speeches, documents
Čašule, Vangia, (1972)