KALAI, Y.; JUNOH, A. K.; WAN MUHAMAD, W. Z. A.; MD DESA, A.; ZAKARIA, M. H. Sobel-Freichen Hybrid Filters to Improve Edge Detection Performance. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), [S. l.], v. 10, n. 1-15, p. 7–10, 2018. Disponível em: https://jtec.utem.edu.my/jtec/article/view/4037. Acesso em: 28 mar. 2024.