@article{SM_2006_197_1_a4,
     author = {A. S. Romanyuk},
     title = {Kolmogorov and trigonometric widths of the {Besov} classes $B^r_{p,\theta}$ of multivariate periodic functions},
     journal = {Sbornik. Mathematics},
     pages = {69--93},
     publisher = {mathdoc},
     volume = {197},
     number = {1},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2006_197_1_a4/}
}