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• "the Avars separated Kuber from his own people and appointed as governor of a region near Byzantine frontier, likely today's Srem" (In Search of the Lost Tribe: The Origins and Making of the Croation Nation, Osman Karatay, Ayse Demiral, 2003, page 147.)
• "We are further told the Avar Khakan set over the new nation thus created a chief named Kuber, who apparently had his capital at Sirmium." (The Journal of the Anthropological institute, Royal anthropological institute, 1882, page 227.)
• "At about the same time, another Proto-Bulgar leader, Kuber, who had been with the Avars in Pannonia, broke away from them and went south with a number of his compatriots and settled in Macedonia, in the region known as Pelagonia" (Bulgarian Folk Customs, Mercia MacDermott, Jessica Kingsley Publishers, 1998, page 21.)
• "These people came together to form the basically Greek tribe of the Sermesians, over whom the Avar Khagan placed a chieftain, of whom our source states that he was called Kouver" (Macedonia, 4000 years of Greek history and civilization, M. V. Sakellariou, Ekdotikè Athenon, 1992, page 255.)
• "The proto-Bulgarian Khan Kuber settled in modern central FYROM in the Prilep field with permission from the Byzantine authorities in Salonica in 680 AD" (Contested Ethnic Identity: The Case of Macedonian Immigrants in Toronto, 1900-1996, Chris Kostov, Peter Lang, 2010, page 49.)
• "His brother, Kan Kuber, created a "second Bulgaria" in the Balkans (also around 680) by rising against the Avars and retreating into the region of the town of Bitola in present-day Macedonia" (World Changer: Atanasoff and the Computer, Tammara Burton, Tangra TanNakRa, 2006, page 19.)
• "But Kuver, though he was a vassal of the Avar Khagan" (Papers, Том 13, Dumbarton Oaks, Johnson Reprint Corp., 1967, page 17.)
• http://www.historyonmaps.com/ColourSamples/cbig/Avarok.jpg
• http://budapestcity.org/02-tortenet/03-okor/avarok1.jpg archive copy at the

Wayback Machine

• http://www.timediver.de/img/geschichte/Albanien/vrap/mh_Khan_Kuber_Vrap.jpg
• Dragan Brujić, Vodič kroz svet Vizantije, Beograd, 2004.
• The Times History of Europe, Times Books, London, 2002.
• Prof. dr Radmilo Petrović, Vojvodina - petnaest milenijuma kulturne istorije, Beograd, 2003.