@article{TM_1988_181_a15,
     author = {V. N. Temlyakov},
     title = {Estimates for the best bilinear approximations of periodic functions},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {250--267},
     publisher = {mathdoc},
     volume = {181},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1988_181_a15/}
}