KALATALOVA, M. A. Theorems of the Tauber type for binary series summable by the Cesaro methods . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 23, n. 6, p. 733–744, 1971. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8620. Acesso em: 5 dec. 2025.