Jeffreys, Elizabeth. "Digenis and Charos: G and E Reconsidered". In ΦΙΛΕΛΛΗΝ: Studies in Honour of Robert Browning (Costas N. Constantinides, Nikolaos M. Panagiotakes, Elizabeth Jeffreys and Athanasios D. Angelou, eds. Venice: Istituto Ellenico di Studi Bizantini e Postbizantini di Venezia, 1996): 117-131.
ISBN 9607743008; 9789607743008