Lorien, Antika, and Theophilus Wellem. “Implementasi Sistem Otentikasi Dokumen Berbasis Quick Response (QR) Code Dan Digital Signature”. Jurnal RESTI (Rekayasa Sistem dan Teknologi Informasi) 5, no. 4 (August 20, 2021): 663 - 671. Accessed July 3, 2022. https://jurnal.iaii.or.id/index.php/RESTI/article/view/3316.