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 J. E. S. Thompson, Maya Hieroglyphic Writing: Introduction, CIWP 589 (1950), pp. 110-11, 274-75; V. Garth Norman, Izapa Sculpture,Part 2: Text, NWAF 30 (1976), pp. 30-36, 225-28, and elsewhere; Jacinto Quirarte, "Tricephalic Units in Olmec, Izapan-Style, and Maya Art," in The Olmec and Their Neighbors: Essays in Memory of Matthew W. Stirling, ed. Elizabeth P. Benson (Washington: Dumbarton Oaks, 1981), pp. 289-308.