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Т. Тепнадзе 2021. Ces`aro means of negative order of the one-dimensional Vilenkin-Fourier series. BULLETIN OF THE L.N. GUMILYOV EURASIAN NATIONAL UNIVERSITY. Mathematics. Computer science. Mechanics series. 135, 2 (Jun. 2021), 6–11. DOI:https://doi.org/10.32523/bulmathenu.2021/2.1.