SLYUSARCHUK, V. E. Essentially unstable solutions of difference equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 12, p. 1659–1672, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4770. Acesso em: 6 dec. 2025.