Adhikari, B. N., P. S. Gautam, S. Upadhyay, and U. C. Prakash. “Accuracy of GRK-2200T Auto-Refkeratometer in Subjective Acceptance for Refractive Errors”. Birat Journal of Health Sciences, vol. 4, no. 1, May 2019, pp. 645-8, doi:10.3126/bjhs.v4i1.23939.