Skaskiv О. B.; LUTSISHIN , M. R. Minimum of the multiple Dirichlet series . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 9, p. 1295–1297, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8187. Acesso em: 5 dec. 2025.