1.
Mitropolskiy YA, Khoma-Mohyl’s’kaSH. Conditions for the Existence of Solutions of a Periodic Boundary-Value Problem for an Inhomogeneous Linear Hyperbolic Equation of the Second Order. I. Ukr. Mat. Zhurn. [Internet]. 2005Jul.25 [cited 2024Nov.22];57(7):912–921. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3653