using collocation method for solving differential equations with time lag. Baghdad Science Journal, Iraq, Baghdad, v. 2, n. 4, p. 684–688, 2005. DOI: 10.21123/bsj.2005.668. Disponível em: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/668.. Acesso em: 23 jul. 2024.