MANDAL, Rakesh Kumar; MANNA, N. R. Handwritten English Character Recognition using Pixel Density Gradient Method. International Journal of Computer Sciences and Engineering, [S. l.], v. 2, n. 3, p. 1–8, 2014. Disponível em: https://ijcse.isroset.org/index.php/j/article/view/49. Acesso em: 2 feb. 2026.