@article{Kirilich_Firman_2016, title={Problem without initial conditions for a countable semilinear hyperbolic system of first-order equations}, volume={68}, url={https://umj.imath.kiev.ua/index.php/umj/article/view/1900}, abstractNote={We derive sufficient conditions for the solvability of the problem without initial conditions for a countable semilinear
hyperbolic system of first-order equations and establish conditions for the classical solvability of the initial-boundary value
problem for countable hyperbolic systems of semilinear equations of the first-order in a semistrip.}, number={8}, journal={Ukrainsâ€™kyi Matematychnyi Zhurnal}, author={Kirilich, V. M. and Firman, T. I.}, year={2016}, month={Aug.}, pages={1043-1055} }