TKACHENKO, V. I. On Reducibility of Systems of Linear Differential Equations with Quasiperiodic Skew-Adjoint Matrices. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 54, n. 3, p. 419–424, 2002. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4079. Acesso em: 5 dec. 2025.