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Kharakhanian, I.M. 2002. ON THE EQUATION ${\bf{\it h}}x-x{\bf{\it k}}=c$ IN BANACH ALGEBRA ${\bf{\it A}}$, WITH HERMITIAN COEFFICIENTS ${\bf{\it h}}, {\bf{\it k}}$. Proceedings of the YSU A: Physical and Mathematical Sciences. 36, 1 (197) (Mar. 2002), 3–8. DOI:https://doi.org/10.46991/PYSUA.2002.36.1.003.