1. Ophthalmic Optics;COWAN, A.,1928
2. System of Ophthalmology;DUKE-ELDER, S.; ABRAMS, D.,1970
3. The Anatomy of the Visual System;Kimpton, London; WYBAR, K.,1961
4. (i 866) "Handbuch des physiologischen Optik", trans. from;HELMHOLTZ, H.;Optical Society,1924
5. Cited by Duke-Elder and Abrams (I970;LISTING, J.B.;J. opt. Soc. Amer,1853