A. G., Bakan; GOLUB, A. P. Certain negative results on consequences of the first kind multipliers. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 3, p. 305–309, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8098. Acesso em: 5 dec. 2025.