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Cawley, Charles. 'Bulgaria: Chapter 1C-Tsars of the Bulgarians 997-1018 and 1040...
Full citation
Cawley, Charles. 'Bulgaria: Chapter 1C-Tsars of the Bulgarians 997-1018 and 1040-1041 (Kometopouloi)' version 3.1-23 March 2016 in Medieval Lands: A prosopography of medieval European noble and royalfamilies. Foundation of Medieval Genealogy http://fmg.ac/ : viewed 5 July 2017.