Singular perturbation method for nonlinear second order evolution inclusions with Volterra-type operators. Neliniini Kolyvannya, [S. l.], v. 12, n. 1, p. 27–43, 2009. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/505. Acesso em: 21 jan. 2026.