Metro Tickets Booking and Checking Qrcode and Gps. International Journal of Engineering Research and Science & Technology, [S. l.], v. 22, n. 2(2), p. 585–593, 2026. DOI: 10.62643/. Disponível em: https://ijerst.org/index.php/ijerst/article/view/3170. Acesso em: 20 jun. 2026.