ATLASIUK, O. M.; MIKHAILETS, V. A. Fredholm one-dimensional boundary-value problems in Sobolev spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 70, n. 10, p. 1324–1333, 2018. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1638. Acesso em: 5 dec. 2025.