BELOVS, M.; CIRULIS, T. Degenerate matrices methods by splines for boundary values problems of ordinary differential equations. Mathematical Modelling and Analysis, [S. l.], v. 10, n. 2, p. 127–140, 2005. DOI: 10.3846/13926292.2005.9637277. Disponível em: https://journals.vilniustech.lt/index.php/MMA/article/view/9669. Acesso em: 9 may. 2025.