Boichuk О. A.; Pokutnyi О. О. Application of the ergodic theory to the investigation of a boundaryvalue problem with periodic operator coefficient. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 65, n. 3, p. 329–338, 2013. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2422. Acesso em: 5 dec. 2025.