Y.K. Khudayberganov and J.I. Sharipov (2026) “ILL-POSED INITIAL–BOUNDARY VALUE PROBLEM FOR A SYSTEM OF MIXED-TYPE EQUATIONS WITH TWO DEGENERATE PLANES”, IMRAS, 9(5), pp. 137–152. Available at: https://journal.imras.org/index.php/sps/article/view/2971 (Accessed: 23 October 2026).