1. Atkins, L., Rosenthal, M. K.: Multiple congenital abnormalities associated with chromosomal trisomy. New Eng. J. Med. 265, 314?318 (1961)
2. Colacino, S. C.: An anatomical study of the 13 trisomy syndrome based on four cases. Ph. D. Thesis, Dept. Anatomy, University of Wisconsin, Madison, Wis. U.S.A., 1976
3. Conen, P. E., Phillips, K. G., Maunter, L. S.: Multiple developmental anomalies and trisomy of a 13?15 group chromosome (?D? Syndrome). Canad. Med. Ass. J. 87, 709?712 (1962)
4. Duke-Elder, S.: System of Ophthalmology. Vol. 3, Part 2, p. 342. St. Louis: C. V. Mosby Co. 1963
5. François, J., Matton-Van Leuven, M. T.: Chromosome abnormalities and ophthalmology. J. Pediat. Ophthal. 1, 5?17 (1964)