@article{DAN_1975_224_3_a5,
     author = {V. I. Ivanov},
     title = {Local approximation of periodic functions by linear polynomial methods},
     journal = {Doklady Akademii Nauk},
     pages = {523--524},
     publisher = {mathdoc},
     volume = {224},
     number = {3},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_224_3_a5/}
}