ZADEREI, P. V. Conditions of integration of multiple trigonometric series . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 3, p. 340–365, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8103. Acesso em: 6 dec. 2025.