HOJEEN M. HAJI, RAAD N. BUTRIS, HEZHA H. ABDULKAREEM, DLOVAN H. OMAR. Periodic Solution for Nonlinear Second Order Differential Equation System. Turkish Journal of Computer and Mathematics Education (TURCOMAT), [S. l.], v. 13, n. 03, p. 324–334, 2022. DOI: 10.17762/turcomat.v13i03.12968. Disponível em: https://turcomat.org/index.php/turkbilmat/article/view/12968. Acesso em: 29 apr. 2024.