@article{IVM_1975_1_a1,
     author = {G. D. Velev},
     title = {Approximation by trigonometric sums of {Bern\v{s}tein} type},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {9--20},
     publisher = {mathdoc},
     number = {1},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1975_1_a1/}
}