KUZNETSOVCI, O. I. Asymptotic behavior of Lebesgue functions of two variables. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 2, p. 220–226, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5406. Acesso em: 7 apr. 2025.