BARKHAYEV, P. Yu.; RABAH, R.; SKLYAR, G. M. On the problem of exact controllability of neutral systems with time delay. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 68, n. 6, p. 800–815, 2016. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1879. Acesso em: 6 dec. 2025.