(en) Constantine Zuckerman, « On the Date of the Khazars' Conversion to Judaism and the Chronology of the Kings of the Rus Oleg and Igor. A Study of the Anonymous Khazar Letter from the Genizah of Cairo », Revue des études byzantines, vol. 53, , p. 237-270 (ISSN2261-060X, lire en ligne)
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(en) Constantine Zuckerman, « On the Date of the Khazars' Conversion to Judaism and the Chronology of the Kings of the Rus Oleg and Igor. A Study of the Anonymous Khazar Letter from the Genizah of Cairo », Revue des études byzantines, vol. 53, , p. 237-270 (ISSN2261-060X, lire en ligne)
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(en) Vladimir Petrukhin, « Sacral Kingship and the Judaism of the Khazars », Studia Medievalia Septentrionalia, vol. 23 « Conversions: Looking for Ideological Change in the Early Middle Ages », , p. 291-301 (lire en ligne)