1. 1. Shaw EL: Diagnosis and pathophysiology of keratoconus Contact Lens Med Bull Vol. 7 No. 3 1974.
2. 2. Chi HH Katzin HM Teng CC: Histopathology of keratoconus Amer J Ophthal 41:847-860 1956.
3. 3. Hervonet F: Anatomie pathologique du keratocone Arch Ophthal (Paris) 18:431-442 1958.
4. 4. Teng CC: Electron microscope study of the pathology of keratoconus I Amer J Ophthal 55:1847 1963.
5. 5. Terrien F: Ectasia transitorie au cours de keratocone Arch Ophtal (Paris) 26:9 1906.