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Pjanić, K. 2024. On the Functional Equation $\boldsymbol{U}_{\boldsymbol{t}}\boldsymbol{+} \boldsymbol{U}_{\boldsymbol{-t}} = \boldsymbol{V}_{\boldsymbol{t}} \boldsymbol{+} \boldsymbol{V}_{\boldsymbol{-t}}$ in a Banach Space. Sarajevo Journal of Mathematics. 3, 2 (Jun. 2024), 241–248. DOI:https://doi.org/10.5644/SJM.03.2.10.