SAKAR, M. G. Numerical solution of neutral functional-differential equations with proportional delays. An International Journal of Optimization and Control: Theories & Applications (IJOCTA), [S. l.], v. 7, n. 2, p. 186–194, 2017. DOI: 10.11121/ijocta.01.2017.00360. Disponível em: http://ijocta.org/index.php/files/article/view/360. Acesso em: 22 jan. 2025.