SLYUSARCHUK, V. Yu. Necessary and sufficient conditions for the absolute instability of solutions of linear differential-difference equations with self-adjoint operator coefficients. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 70, n. 5, p. 715–724, 2018. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1590. Acesso em: 6 dec. 2025.