3-4. - Bidez, Joseph. (OLS)http://ftis/name/51698; Grillet, Bernard. (OLS)http://ftis/name/51699; Festugière, André-Jean. (OLS)http://ftis/name/51701; Sabbah, Guy. (OLS)http://ftis/name/51700 (Histoire ecclésiastique, 1996)