1. 1. Treatment options for advanced keratoconus: A review. Jack S. Parker MD, Korine van Dijk BSc y Gerrit R.J. Melles MD, PhD. 2015, Survey of Oph- thalmology, Copyright © 2015 Elsevier Inc., pág. 22.
2. 2. Corneal collagen cross-linking for treating keratoconu. Sykakis E, Karim R, Evans JR, Bunce C, Amissah-Arthur KN, Patwary S, McDonnell PJ,. 3, Vol. The Cochrane Library.
3. 3. Wojcik KA, Blasiak J, Sza ik J, Sza ik JP. Role of biochemical factors in the pathogenesis of keratoconus. Acta Biochim Pol. 2014;61(1):55-62.
4. 4. Intrastromal corneal ring segments for treating keratoconus. Zadnik, Karla y Lindsley, Kristina. s.l.: Cochrane Eyes and Vision Group, 2014, Vols. EBM Reviews - Cochrane Database of Systematic Reviews.
5. 5. Alio JL, Vega-Estrada A, Esperanza S, Barraquer RI, Teus MA, Murta J. Intrastromal corneal ring segments: how successful is the surgical treatment of keratoconus? Middle East Afr J Ophthalmol 2014 Jan-Mar;21(1):3-9