Kmit, I.Y. (2013) “Fredholm solvability of a periodic Neumann problem for a linear telegraph equation”, Ukrains’kyi Matematychnyi Zhurnal, 65(3), pp. 381–391. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2425 (Accessed: 5 December 2025).