K. Prasetyo, U. Pasaribu, S. Riyanto, and J. Hutauruk, “Vector Analysis of Anticipated Residual Astigmatism and Actual Residual Astigmatism in Toric IOL Implantation using Callisto-Eye”, OI, vol. 43, no. 1, p. 87, Jan. 2019, doi: 10.35749/journal.v43i1.145.