Utilising QR-Code of Covid-19 Vaccine for Attendance Using Extreme Programming Method: PEMANFAATAN QR-CODE VAKSIN COVID-19 UNTUK ABSENSI MENGGUNAKAN METODE EXTREME PROGRAMMING. antivirus [Internet]. 2023 Nov. 30 [cited 2026 Feb. 5];17(2):193-202. Available from: https://ejournal.unisbablitar.ac.id/index.php/antivirus/article/view/3217