IMASH KYZY, M.; ABDULLAYEV, F. G.; BUSHEV, D. M.; KHARKEVYCH, Yu. I. Isometry of the subspacesof solutions of systems of differential equations to the spaces of real functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 71, n. 8, p. 1011–1027, 2019. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1494. Acesso em: 5 dec. 2025.