G. Vernadsky, The Beginnings of the Czech State, Byzantion, 17 (1945), 315 – 328.
309
Древняя Русь, гл. VIII, 6; см. также: G. Vernadsky, Great Moravia and White Chorvatia, JAOS, 65 (1945), 257 – 259; G. Vernadsky, Note on Zhupan, JAOS, 67 (1947), p. 62.
