Beaton, Roderick. "Was Digenes Akrites an Oral Poem?". Byzantine and Modern Greek Studies 7 (1981): 7-27.
Reprinted in Roderick Beaton. From Byzantium to Modern Greece: Medieval Texts and their Modern Reception. Variorum Collected Studies Series, CS911. Abingdon, Oxon: Ashgate Publishing, 2008: Ch. V.