@article{IM2_2003_67_2_a3,
     author = {A. S. Romanyuk},
     title = {Best $M$-term trigonometric approximations of {Besov} classes of periodic functions of several variables},
     journal = {Izvestiya. Mathematics},
     pages = {265--302},
     year = {2003},
     volume = {67},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2003_67_2_a3/}
}