"Kievskoe pis'mo" chazarskich evreev. K probleme kritiki soderžanija istočnika. ("Kievan letter" of the Khazar jews. On the problem of criticism of the contents of the source) - Tortika, A. A. (Materialy po Archeologii, Istorii i Etnografii Tavrii, 9 (2002), 2002)