Solution of Nonlinear Ordinary Delay Differential Equations Using Variational Approach. Al-Nahrain Journal of Science, [S. l.], v. 15, n. 4, p. 183–187, 2012. Disponível em: https://anjs.edu.iq/index.php/anjs/article/view/618.. Acesso em: 14 may. 2024.