SHEU, J.-S.; TENG, K.-C. Improvement of QR Code Recognition Based on Pillbox Filter Analysis. International Journal of Engineering and Technology Innovation, [S. l.], v. 3, n. 2, p. 123–133, 2013. Disponível em: https://ojs.imeti.org/index.php/IJETI/article/view/104. Acesso em: 22 may. 2024.