Avramovski, Živko: Bugarske pretenzije na aneksiju delova Kosova u Prvom svetskom ratu (1915-1916) (Bulgaria's pretensions on the annexation of parts of Kosovo in the First World War (1915-1916)), in: Avramovski, Živko (ed.): Jugoslovensko-bugarski odnosi u XX veku (Yugoslav-Bulgarian relations in the twentieth century, volume 2), Belgrade 1982, pp. 110-159.