19.拜占庭商人则在那里出售丝绸：Thomas S. Noonan, “European Russia, c. 500-c. 1050.” The New Cambridge Medieval History, Volume 3: c. 900-c. 1204, ed. Timothy Reuter (1999)：487—513页，490—491页提到切尔森，494—495页提到东部斯拉夫人的居住地，506—509页提到公元900年以后的罗斯人贸易。
20.罗斯人自称基督徒：Lunde and Stone, Ibn Fadlān and the Land of Darkness, 112; Jonathan Shepard, “Byzantine Emissions, not Missions, to Rus’, and the Problems of ‘False’ Christians”, Rus’ in the 9th-12th Centuries: Society, State, Culture, ed. N. A. Makarov and A. E. Leontiev (2014): 234-242.