On Linear Differential Equations on the Torus and Non-Standard Analysis. Advances in Systems Science and Applications, [S. l.], v. 2025, n. 1, p. 12–21, 2025. DOI: 10.25728/assa.2025.2025.1.2040. Disponível em: https://ijassa.ipu.ru/index.php/ijassa/article/view/2040. Acesso em: 7 oct. 2025.