IVANYUK, N. N. Construction of asymptotic representations of solutions from the classL?? for systems of differential equations by the method of characteristic matrix functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 9, p. 1148–1155, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5631. Acesso em: 5 dec. 2025.