Y.K. Khudayberganov1, J.I. Sharipov. ILL-POSED INITIAL–BOUNDARY VALUE PROBLEM FOR A SYSTEM OF MIXED-TYPE EQUATIONS WITH TWO DEGENERATE PLANES. IMRAS [Internet]. 2026 Aug. 1 [cited 2026 Oct. 23];9(5):137-52. Available from: https://journal.imras.org/index.php/sps/article/view/2971