1. HARRINGTON, D. 0. (1951). Amer. J. Ophthal., 34, 1395.
2. HILL, H. F. (1957). Trans. Amer. Ophthal. Otolaryng., "Cataract Surgery", Instructional Section, Course No. 16T.
3. NIRANKARI, M. S., and MAUDGAL, M. C. (1957). Brit. J. Ophthal., 41, 487.
4. The Effect on Binocular Vision of Variations in the Relative Sizes and Levels of Illumination of the Ocular Images;By; GILLoTr, H.F.,1957