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Mamajonov , M. and Mamajonov , S. 2024. ON A BOUNDARY VALUE PROBLEM FOR A FOURTH-ORDER EQUATION OF PARABOLIC-HYPERBOLIC TYPE IN A MIXED PENTAGONAL DOMAIN WITH THREE LINES OF TYPE CHANGE, WHEN ONE OF THE CHARACTERISTICS OF THE FIRST-ORDER OPERATORS IS PARALLEL TO THE AXIS, AND THE OTHER HAS A SL. Journal of Osh State University. Mathematics. Physics. Technical Sciences. 2(5) (Dec. 2024), 116–133. DOI:https://doi.org/10.52754/16948645_2024_2(5)_15.