Numerical Solution of Varible Differential Equations Using Runge- Kutta Methods. Al-Nahrain Journal of Science, [S. l.], v. 9, n. 2, p. 138–142, 2006. Disponível em: https://anjs.edu.iq/index.php/anjs/article/view/1679.. Acesso em: 12 may. 2024.