Introduction G. Ostrogorsky, Vierteljahrshrift f. Sozial- und Wirtschaftsgeschichte, XX, pp. 66, 69f. "The Bulgars in the Balkans and the Occupation of Corinth in the Seventh Century", Speculum, 1950, pp. 502-543 "Athens in the Later Twelfth Century", Speculum, 1944, pp. 179-207 Corinth, XII, The Minor Objects, p. 5, note 8
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