Tauseef Dildar, Muhammad, et al. “COMPARISON OF CENTRAL CORNEAL THICKNESS MEASUREMENTS WITH THE GALILEI DUAL SCHEIMPFLUG ANALYZER AND ULTRASOUND PACHYMETRY: Galilei Dual Scheimpflug Analyzer And Ultrasound Pachymetry”. Pakistan Armed Forces Medical Journal, vol. 67, no. 6, Dec. 2017, pp. 1050-53, https://pafmj.org/PAFMJ/article/view/1041.