1. 1. Boyd S, Gutierrez AM, McCulley JP. Atlas and text of corneal pathology and surgery. Panamá: Jayppe-Highlights Medical Publisher; 2011.
2. 2. Lang GK. Oftalmología: Texto y atlas en color. Barcelona: Masson; 2006.
3. 3. Rodríguez M. Inmunología ocular. Bogotá: CMYK, Diseño e Impresos; 2012.
4. Cataract formation and cataract extraction after penetrating keratoplasty;Martin;Ophthalmology,1994
5. 5. Girard LJ, Esnaola N, Rao R, Barnett L, el Maghraby A, Canizales R. Allograft rejection after penetrating keratoplasty for keratoconus. Ophthalmic Surg. 1993;24(1):40-3.