Orthogonal Exponentials of Planar Self-Affine Measures with Four-Element Digit Set. Journal of Mathematical Study, [S. l.], v. 55, n. 3, p. 327–336, 2022. DOI: 10.4208/jms.v55n3.22.07. Disponível em: https://www.global-sci.com/index.php/jms/article/view/13429. Acesso em: 5 dec. 2025.