V. Durasov, Dueling codex Archived 2007-09-27 at the Wayback Machine, as cited in Yuri Lotman, Пушкин.
Durasov, Dueling codex Αρχειοθετήθηκε 2007-09-27 στο Wayback Machine., as cited in Yuri Lotman, Пушкин.