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Links
Against the Sabellians
http://www.ccel.org/ccel/schaff/anf07.vii.ii.html
A fragment of a letter by Dionysius, found in St. Athanasius' De Decretis Nicaenae Synodi. With notes. From the Ante-Nicene Fathers, vol. 7.
http://www.ccel.org/ccel/schaff/anf07.vii.ii.html