On approximation of systems of neutral type of differential-difference equations with systems of ordinary differential equations. Neliniini Kolyvannya, [S. l.], v. 10, n. 3, p. 328–335, 2007. Disponível em: https://nosc.imath.kiev.ua/index.php/nosc/article/view/442. Acesso em: 12 apr. 2026.