Ahmed Abd Ali Abdulkadhim, and Dena Nadir George. “Subject Review: Authentication Techniques for Smartphone”. International Journal of Engineering Research and Advanced Technology - IJERAT (ISSN: 2454-6135) 6, no. 11 (November 14, 2020): 17-20. Accessed January 25, 2021. https://ijerat.com/index.php/ijerat/article/view/495.