1. Early signs of the glaucomatous disc;Primrose;Br. J. Ophthalmol.,1971
2. Textbook of the Fundus of the Eye;Ballantyne,1970
3. Ophthalmic Pathology;Hogan,1962
4. The pathogenesis of optic nerve damage in glaucoma. A review of the vascular hypothesis;Phelps,1972