1. Stepanenko V.P. Zechariah, Archbishop and Ivir. On the interpretation of the concept of Ivir in the sources of the 11th century. Inostrantsy v Vizantii. Vizantiitsy za rubezhami svoego otechestva: Tezisy dokladov mezhdunarodnoi konferentsii [Foreigners in Byzantium. Byzantines outside their homeland: Abstracts of the reports of the international conference], Moscow, 1997, pp. 46–48.
2. Shandrovskaia V.S. Hermitage seals of Filaret Vrahamia (Varazhnuni). Vestnik obshchestvennykh nauk AN Armianskoi SSR [Bulletin of Social Sciences of the Academy of Sciences of the Armenian SSR], 1975, no. 3, pp. 36–49.
3. Cheynet J.-Cl., Vannier J.-F. Etudes prosopographiques. Paris, 1986, 206 p.
4. Seibt W. The Byzantine Thema of Soteroupolis-Anakopia in the 11th Century. Bulletin of the Georgian National Academy of Sciences, 2012, vol. 6, no. 2, pp. 174–178.
5. Seibt W., Jordanov I. Στρατηγoς Σωτηρουπoλεως καì Ἀνακουπίας. Ein mittelbyzantinisches Kommando in Abchazien (11. Jahrhundert). Studies in Byzantine Sigillography, 2006, vol. 9, pp. 231–239.
6. Wharton A.J. Art of Empire: Painting and Architecture of the Byzantine Periphery. A Comparative Study of Four Provinces. Pennsylvania State University Press, 1988, 250 p.
