Zeng, Zhe, Felix Wilhelm Siebert, Antje Christine Venjakob, and Matthias Roetting. “Calibration-Free Gaze Interfaces Based on Linear Smooth Pursuit”. Journal of Eye Movement Research 13, no. 1 (March 10, 2020). Accessed June 13, 2021. https://bop.unibe.ch/JEMR/article/view/JEMR.13.1.3.