Ferdiansyah, Fahmi Reza, and Rudy Sofian. “Implementasi Teknologi QR Code Dan Location Based Service Pada Presensi Mobile Flutter”. Jurnal Ilmiah Intech : Information Technology Journal of UMUS, vol. 5, no. 2, Nov. 2023, pp. 85-97, doi:10.46772/intech.v5i2.1032.