Agrawal, Nisha, and S K Singh. “Collagen Cross-Linking in Recalcitrant Corneal Ulcers: A Case Series”. Nepalese Journal of Ophthalmology 8, no. 1 (December 12, 2016): 47–53. Accessed September 18, 2024. https://nepjol.info/index.php/NEPJOPH/article/view/16156.