@article{MZM_1977_22_1_a9,
     author = {A. V. Kro\'o},
     title = {The correctness problem for best approximations by trigonometric polynomials in the class $W_0^rH[\omega]_C$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {85--101},
     year = {1977},
     volume = {22},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_22_1_a9/}
}