3 citations to https://www.mathnet.ru/rus/mzm531
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Sadulla Jafarov, “Approximation by Zygmund means in variable exponent Lebesque spaces”, Mathematica Moravica, 23:1 (2019), 27
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Chikina T.S., “Approximation by Zygmund-Riesz Means in the P-Variation Metric”, Anal. Math., 39:1 (2013), 29–44
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Т. В. Иофина, “О порядке приближения средними Рисса по мультипликативным системам на классах $E_X[\varepsilon]$”, Матем. заметки, 89:4 (2011), 508–523 ; T. V. Iofina, “On the Order of Approximation by Riesz Means in Multiplicative Systems in the Classes $E_X[\varepsilon]$”, Math. Notes, 89:4 (2011), 484–498