MIKHAILETS, V. A.; MURACH, A. A. On the unconditional almost-everywhere convergence of general orthogonal series. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 63, n. 10, p. 1360–1367, 2011. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2812. Acesso em: 5 dec. 2025.