The Avar-Byzantine wars of the late sixth century as depicted by Nikephoros Kallistos Xanthopoulos
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Ivanov, S. A. (2013). The Avar-Byzantine wars of the late sixth century as depicted by Nikephoros Kallistos Xanthopoulos: A new source?, (50), 123-148. Retrieved from http://www.doiserbia.nb.rs/Article.aspx?id=0584-98881301123I