Aldashev, S. A. (1997) “Many-dimensional Dirichlet and Tricomi problems for one class of hyperbolic-elliptic equations”, Ukrains’kyi Matematychnyi Zhurnal, 49(12), pp. 1587–1593. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5162 (Accessed: 19May2024).