The approximation of functions of certain classes determined by polyharmonic operators, by truncated arithmetic means of partial sums of Fourier series
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 15 (1960) no. 5

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     author = {V. N. Trofimov},
     title = {The approximation of functions of certain classes determined by polyharmonic operators, by truncated arithmetic means of partial sums of {Fourier} series},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {15},
     number = {5},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1960_15_5_a11/}
}
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V. N. Trofimov. The approximation of functions of certain classes determined by polyharmonic operators, by truncated arithmetic means of partial sums of Fourier series. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 15 (1960) no. 5. http://geodesic.mathdoc.fr/item/RM_1960_15_5_a11/