Baskin, D, and S Waller. “Implantation of Collagen Punctal Plugs for the Reduction of Post-Keratoplasty Ametropia”. Nepalese Journal of Ophthalmology, vol. 1, no. 1, Sept. 2010, pp. 72-74, doi:10.3126/nepjoph.v1i1.3676.