O proischoždenii dvoevlastija u chazar i obstojatel'stvach ich obraščenija v iudaizm. (On the origin of the Khazar diarchy and the circumstances of Khazaria's conversion to judaism) - Zuckerman, C. (Materialy po Archeologii, Istorii i Etnografii Tavrii, 9 (2002), 2002)