Yee, P. L. and Mat Kiah, M. L. (2010) “Shoulder Surfing Resistance Using PENUP Event And Neighboring Connectivity Manipulation”, Malaysian Journal of Computer Science, 23(2), pp. 121–140. Available at: https://ejournal.um.edu.my/index.php/MJCS/article/view/6404 (Accessed: 17 May 2024).