90. Legge, op. cit, p. 281; Wellburn, op. cit, pp. 67–68.
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91. Encyclopaedia of Heresies and Heretics, p. 87;Penguin Dictionary of Religions, p. 201;Oxford Dictionary of the Christian Church, p. 864; Wellburn, op. cit, p. 108; Runciman op. cit, pp. 6–17; Legge, op. cit, p. 281.