SLEPENCHUK, K. M. An analogue of one Han’s theorem for infinite products . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 40, n. 5, p. 662–665, 1988. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8823. Acesso em: 5 dec. 2025.