1. Bach, L., Seefelder, R.: Atlas zur Entwicklungsgeschichte des menschlichen Auges. Leipzig: Engelmann 1912.
2. Barber, A. N.: Embryology of the human eye. St. Louis: C. V. Mosby Co. 1955.
3. Brini, A., Porte, A., Stoeckel, M. E.: Développement ultrastructural des muscles iriens chez l'embryon de poulet. Bull. Soc. Franc. Ophthal. 77, 488?497 (1964).
4. Burnstock, G.: Structure of smooth muscle and its innervation. In: Smooth muscle, ed. by Bülbring, E., A. F. Brading, A. W. Jones, T. Tromita, p. 2?69, 1st ed. London: Edward Arnold (Publishers), Ltd. 1970.
5. Hogan, N. J., Alvarado, J. A., Wedell, J. E.: Histology of the human eye. An atlas and textbook. Philadelphia-London-Toronto: Saunders Co. 1971.