@article{IM2_1979_13_1_a4,
     author = {V. E. Maiorov},
     title = {Various widths of the class $H_p^r$ in the space~$L_q$},
     journal = {Izvestiya. Mathematics },
     pages = {73--87},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {1979},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1979_13_1_a4/}
}