Arbelaez, M. C., Sekito, M. B., Vidal, C., & Choudhury, S. R. (2009). Collagen cross-linking with riboflavin and ultraviolet-A light in keratoconus: One-year results. Oman Journal of Ophthalmology, 2(1), 33-38. https://doi.org/10.4103/0974-620x.48420