Crisis in Byzantium: The Filioque Controversy in the Patriarchate of Gregory II of Cyprus (1283-1289)
by Aristeides Papadakis
John Chrysostom and His Time, Volume Two, Part Two: Constantinople׃ The Later Years
by Rev. Chrysostomus Baur, O. S. B.
Translated by Sr. M. Gonzaga, R. S. M.