@article{RM_1960_15_1_a14,
     author = {P. P. Korovkin},
     title = {Asymptotic properties of positive methods for summation of {Fourier} series},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1960_15_1_a14/}
}