Nonlinear second order Noether boundary-value problems in the critical case. Neliniini Kolyvannya, [S. l.], v. 17, n. 2, p. 281–292, 2014. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/744. Acesso em: 8 dec. 2025.