NAVICKAS, Z.; BIKULČIENE, L. Expressions of solutions of ordinary differential equations by standard functions. Mathematical Modelling and Analysis, [S. l.], v. 11, n. 4, p. 399–412, 2006. DOI: 10.3846/13926292.2006.9637327. Disponível em: https://journals.vilniustech.lt/index.php/MMA/article/view/9649. Acesso em: 17 may. 2025.