1. Prince JH:Comparative Anatomy of the Eye.Springfield, III: Charles C Thomas Publisher, 1956, pp 24–31, 286–297.
2. Fink WH: Surgeryof the Oblique Muscles of the Eye.St Louis, CV Mosby Co, 1951, p 51.
3. Wolff E:Anatomy of the Eye and Orbit, ed 6, Last RJ (ed). Philadelphia, WB Saunders Co, 1968, pp 419–515.