Nguyen Thanh Thuy. “APPLICATION OF QR CODE AND DIGITAL SIGNATURES TO THE PROCESS OF PREVENTING THE FORGERY OF PAPER-BASED DIPLOMAS AND CERTIFICATES”. UED Journal of Social Sciences, Humanities and Education 4, no. 4 (December 25, 2014): 28-34. Accessed June 12, 2021. https://jshe.ued.udn.vn/index.php/jshe/article/view/349.