A von Neumann boundary-value problem for a singularly perturbed heat equation with an impulsive effect. Neliniini Kolyvannya, [S. l.], v. 8, n. 1, p. 89–122, 2005. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/338. Acesso em: 22 jan. 2026.