GAVRILYUK , V. T.; STEPANETS , A. I. Problems of saturation of linear methods. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 43, n. 3, p. 291–308, 1991. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9607. Acesso em: 6 dec. 2025.