Solution to the periodic problem  for the impulsive hyperbolic equation  with discrete memory. Kazakh Mathematical Journal, [S. l.], v. 25, n. 1, p. 16–27, 2025. DOI: 10.70474/kmj-25-1-02. Disponível em: https://mathjournal.kz/index.php/kmj/article/view/33. Acesso em: 31 jan. 2025.