@article{SM_2004_195_2_a3,
     author = {A. S. Romanyuk},
     title = {Approximability  of the classes $B_{p,\theta}^r$ of periodic functions
},
     journal = {Sbornik. Mathematics},
     pages = {237--261},
     publisher = {mathdoc},
     volume = {195},
     number = {2},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2004_195_2_a3/}
}