Solution of Variavle Delay integral eqiations using Variational approach. Baghdad Science Journal, Iraq, Baghdad, v. 3, n. 3, p. 481–487, 2006. DOI: 10.21123/bsj.2006.729. Disponível em: https://bsj-ojs.uobaghdad.edu.iq/index.php/BSJ/article/view/729.. Acesso em: 19 jun. 2025.