ALMENAR, Pedro; JODAR, Lucas. Solvability of a Class of N -th Order Linear Focal Problems. Mathematical Modelling and Analysis, [S. l.], v. 22, n. 4, p. 528–547, 2017. DOI: 10.3846/13926292.2017.1329757. Disponível em: https://journals.vilniustech.lt/index.php/MMA/article/view/911. Acesso em: 9 may. 2025.