SLYUSARCHUK, V. Yu. Generalization of Abel and Dirichlet signs. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 72, n. 4, p. 527–539, 2020. DOI: 10.37863/umzh.v72i4.1141. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1141. Acesso em: 5 dec. 2025.