Chaiear, Sirivat. “Indications and Visual Results of Penetrating Keratoplasty in Udonthani Hospital Between 1997 and 2006 : a Retrospective Review of 84 Cases”. Srinagarind Medical Journal 23, no. 2 (November 4, 2013): 207–214. accessed September 16, 2026. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/13074.