Boundary-value problem with pulse action. Critical case of the second order. Neliniini Kolyvannya, [S. l.], v. 26, n. 2, p. 261–273, 2023. DOI: 10.37863/nosc.v26i2.1432. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/1103. Acesso em: 21 jan. 2026.