Dahiya, M., J. P. Chugh, R. S. Chauhan, and A. Rathi. “Clinical Indications of Penetrating Keratoplasty in a Tertiary Care Centre of North India”. International Journal Of Community Medicine And Public Health, vol. 7, no. 9, Aug. 2020, pp. 3439-42, doi:10.18203/2394-6040.ijcmph20203904.