SENDOV, B. Orthogonal basis of fractal functions for compression of images. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 88, p. 409–430, 1996. Disponível em: https://ftl5.uni-sofia.bg/index.php/fmi/article/view/397. Acesso em: 15 may. 2025.