Volosivets, S. S.; Fadeev, R. N. Estimates of best approximations in integral metrics and Fourier coefficients with respect to multiplicative systems. (English) Zbl 1240.42136 Anal. Math. 37, No. 3, 215-238 (2011). MSC: 42C10 PDF BibTeX XML Cite \textit{S. S. Volosivets} and \textit{R. N. Fadeev}, Anal. Math. 37, No. 3, 215--238 (2011; Zbl 1240.42136) Full Text: DOI
Volosivets, S. S.; Golubov, B. I. Absolute convergence of multiple series with respect to multiplicative systems. (Russian. English summary) Zbl 1274.42072 Anal. Math. 36, No. 2, 155-172 (2010). MSC: 42C10 40A05 PDF BibTeX XML Cite \textit{S. S. Volosivets} and \textit{B. I. Golubov}, Anal. Math. 36, No. 2, 155--172 (2010; Zbl 1274.42072) Full Text: DOI