Asymptotic properties of solutions of systems of nonlinear neutral type differential-functional equations. Neliniini Kolyvannya, [S. l.], v. 12, n. 1, p. 20–26, 2009. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/504. Acesso em: 21 jan. 2026.