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2026. Solutions’ Existence for A Hyperbolic Nonlinear Wave Equation of Kirchhoff Type in Unbounded Domains and Estimation of The Upper Bound for The Blow-Up Time of The Solutions. Mathematical Structures and Computational Modeling. 2, (Sep. 2026), 85–101. DOI:https://doi.org/10.65904/3083-1733.2026.2.8.