KMIT, I. Ya. Fredholm solvability of a periodic Neumann problem for a linear telegraph equation. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 65, n. 3, p. 381–391, 2013. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2425. Acesso em: 5 dec. 2025.