Grabar, Oleg. "Islamic Ornament and Western Abstraction." In Islamic Art and Beyond, volume III, Constructing the Study of Islamic Art. Hampshire: Ashgate Publishing Limited, 2006. First published in Markus Bruderlein, ed., Ornament and Abstraction (Basel, 2001), pp. 70-73.
Islamic Art and Beyond Part One: Theory of Art Chapter VIII: Islamic Ornament and Western Abstraction