Estimates of norms of functions represented as double series over cosines with multiple-monotone coefficients
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 5 (2017), pp. 3-13

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We prove lower and upper bounds for the norms of functions being the sums of double series in cosines.
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     author = {T. M. Vukolova},
     title = {Estimates of norms of functions represented as double series over cosines with multiple-monotone coefficients},
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T. M. Vukolova. Estimates of norms of functions represented as double series over cosines with multiple-monotone coefficients. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 5 (2017), pp. 3-13. http://geodesic.mathdoc.fr/item/VMUMM_2017_5_a0/