ALI, Hayat; HASEN, Saba S. Improved High order Euler Method for Numerical Solution of Initial value Time- Lag Differential Equations. Iraqi Journal of Science, [S. l.], v. 59, n. 1B, p. 383–388, 2018. Disponível em: https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/168.. Acesso em: 8 dec. 2025.