Filioque
Malon H. Smith, III.  And Taking Bread: Cerularius and the Azyme Controversy of 1054. Paris: Beauschesne, 1978. This work is still valuable for understanding cultural and theological estrangement of East and West by the turn of the millennium. Now, it is evident that neither side understood the other; both Greek and Latin antagonists assumed their own practices were normative and authentic.