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* {{citation | last = Andriollo | first = Lisa | chapter = Les Kourkouas (IXe-XIe siècle) | language = fr | title = Studies in Byzantine Sigillography | volume = 11 | editor1-last = Cheynet | editor1-first=Jean-Claude | editor2-last = Sode | editor2-first = Claudia | location = Berlin | publisher = De Gruyter | year = 2012 | pages = 57–88 | isbn = 978-3-11-026668-9 | chapter-url = https://www.academia.edu/2074096}}
* {{cite book | editor1-last = Lilie | editor1-first = Ralph-Johannes | editor2-last = Ludwig | editor2-first = Claudia | editor3-last = Zielke | editor3-first = Beate | editor4-last = Pratsch | editor4-first = Thomas | title = Prosopographie der mittelbyzantinischen Zeit Online. Berlin-Brandenburgische Akademie der Wissenschaften. Nach Vorarbeiten F. Winkelmanns erstellt | language = de | publisher = De Gruyter | year = 2013 | url = http://www.degruyter.com/view/db/pmbz | ref={{harvid|PmbZ}}}}
* {{cite book|last=Romane|first=Julian|title=Byzantium Triumphant|date=2015|publisher=Pen and Sword Books|isbn=978-1473845701}}
*''The [[Oxford Dictionary of Byzantium]]'', Oxford University Press, 1991.
*{{EB1911 |wstitle=John I (Roman emperor) | volume=15 |page=438}}
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