1. System of Ophthalmology. Vol. III, Part 2: Normal and Abnormal Development: Congenital Deformities;Duke Elder,1964
2. Developmental and acquired cataracts of infancy and childhood;Cordes,1966
3. Disorders of the lens;McDonald,1975
4. Classification of cataracts in children;Hiles;Int Ophthalmol Clin,1977
5. Examination and functional evaluation of crystalline lens;Phelps,1978