Attainability issue for optimal control problem in coefficients for degenerate parabolic variational inequality. Neliniini Kolyvannya, [S. l.], v. 23, n. 2, p. 200–216, 2020. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/986. Acesso em: 8 dec. 2025.