Yee, Por Lip, and Miss Laiha Mat Kiah. “Shoulder Surfing Resistance Using PENUP Event And Neighboring Connectivity Manipulation”. Malaysian Journal of Computer Science 23, no. 2 (September 1, 2010): 121–140. Accessed December 23, 2024. http://jice.um.edu.my/index.php/MJCS/article/view/6404.