@article{RM_1960_15_5_a11,
     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},
     year = {1960},
     volume = {15},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1960_15_5_a11/}
}