E.B. Harrison, The Athenian Agora, 11, Archaic and Archaistic Sculpture, Princeton 1967, no. 119 Hesperia 8, 1939, pp. 217-218 (Shear, Sr.) Hesperia 17, 1948, pp. 169-170 (Thompson) B. Filov, Sofiskata Tsirkva, Sofia 1973, pp. 49ff. and pls. XV-XVII R.F. Hoddinott, Bulgaria in Antiquity, New York 1975, pp. 271-277