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Dorfmann-Lazarev, Igor (2006) 'The Apostolic Foundation Stone: the conception of Orthodoxy in the controversy between Photius of Constantinople and Isaac Surnamed Mŕut (882).' In: Louth, A. and Casiday, A., (eds.), Byzantine Orthodoxies: Papers from the Thirty-sixth Spring Symposium of Byzantine Studies, University of Durham, 23–25 March 2002. Aldershot: Ashgate, pp. 179-198. (Publications of the Society for the Promotion of Byzantine Studies)