Aldashev, S. A. (2017) “Well-posedness of mixed problems for multidimensional hyperbolic equations with wave operator”, Ukrains’kyi Matematychnyi Zhurnal, 69(7), pp. 992-999. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/1752 (Accessed: 28March2024).